Small manual update, I thought I'd already committed this.

doc/manual_base.lyx

@@ -1,10495 +1,10507 b''
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 \begin_body
 
 \begin_layout Title
 IPython
 \newline
 
 \size larger
 An enhanced Interactive Python
 \size large
 
 \newline
 User Manual, v.
  __version__
 \end_layout
 
 \begin_layout Author
 Fernando P�rez
 \begin_inset Foot
 status collapsed
 
 \begin_layout Standard
 
 \size scriptsize
 Department of Applied Mathematics, University of Colorado at Boulder.
  
 \family typewriter
 <[e-mail]>
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 \begin_layout Section
 Overview
 \end_layout
 
 \begin_layout Standard
 One of Python's most useful features is its interactive interpreter.
  This system allows very fast testing of ideas without the overhead of creating
  test files as is typical in most programming languages.
  However, the interpreter supplied with the standard Python distribution
  is somewhat limited for extended interactive use.
 \end_layout
 
 \begin_layout Standard
 IPython is a free software project (released under the BSD license) which
  tries to:
 \end_layout
 
 \begin_layout Enumerate
 Provide an interactive shell superior to Python's default.
  IPython has many features for object introspection, system shell access,
  and its own special command system for adding functionality when working
  interactively.
  It tries to be a very efficient environment both for Python code development
  and for exploration of problems using Python objects (in situations like
  data analysis).
 \end_layout
 
 \begin_layout Enumerate
 Serve as an embeddable, ready to use interpreter for your own programs.
  IPython can be started with a single call from inside another program,
  providing access to the current namespace.
  This can be very useful both for debugging purposes and for situations
  where a blend of batch-processing and interactive exploration are needed.
 \end_layout
 
 \begin_layout Enumerate
 Offer a flexible framework which can be used as the base environment for
  other systems with Python as the underlying language.
  Specifically scientific environments like Mathematica, IDL and Matlab inspired
  its design, but similar ideas can be useful in many fields.
 \end_layout
 
 \begin_layout Enumerate
 Allow interactive testing of threaded graphical toolkits.
  IPython has support for interactive, non-blocking control of GTK, Qt and
  WX applications via special threading flags.
  The normal Python shell can only do this for Tkinter applications.
 \end_layout
 
 \begin_layout Subsection
 Main features
 \end_layout
 
 \begin_layout Itemize
 Dynamic object introspection.
  One can access docstrings, function definition prototypes, source code,
  source files and other details of any object accessible to the interpreter
  with a single keystroke (`
 \family typewriter
 ?
 \family default
 ', and using `
 \family typewriter
 ??
 \family default
 ' provides additional detail).
 \end_layout
 
 \begin_layout Itemize
 Searching through modules and namespaces with `
 \family typewriter
 *
 \family default
 ' wildcards, both when using the `
 \family typewriter
 ?
 \family default
 ' system and via the 
 \family typewriter
 %psearch
 \family default
  command.
 \end_layout
 
 \begin_layout Itemize
 Completion in the local namespace, by typing TAB at the prompt.
  This works for keywords, methods, variables and files in the current directory.
  This is supported via the readline library, and full access to configuring
  readline's behavior is provided.
 \end_layout
 
 \begin_layout Itemize
 Numbered input/output prompts with command history (persistent across sessions
  and tied to each profile), full searching in this history and caching of
  all input and output.
 \end_layout
 
 \begin_layout Itemize
 User-extensible `magic' commands.
  A set of commands prefixed with 
 \family typewriter
 %
 \family default
  is available for controlling IPython itself and provides directory control,
  namespace information and many aliases to common system shell commands.
 \end_layout
 
 \begin_layout Itemize
 Alias facility for defining your own system aliases.
 \end_layout
 
 \begin_layout Itemize
 Complete system shell access.
  Lines starting with ! are passed directly to the system shell, and using
  !! captures shell output into python variables for further use.
 \end_layout
 
 \begin_layout Itemize
 Background execution of Python commands in a separate thread.
  IPython has an internal job manager called 
 \family typewriter
 jobs
 \family default
 , and a conveninence backgrounding magic function called 
 \family typewriter
 %bg
 \family default
 .
 \end_layout
 
 \begin_layout Itemize
 The ability to expand python variables when calling the system shell.
  In a shell command, any python variable prefixed with 
 \family typewriter
 $
 \family default
  is expanded.
  A double 
 \family typewriter
 $$
 \family default
  allows passing a literal 
 \family typewriter
 $
 \family default
  to the shell (for access to shell and environment variables like 
 \family typewriter
 $PATH
 \family default
 ).
 \end_layout
 
 \begin_layout Itemize
 Filesystem navigation, via a magic 
 \family typewriter
 %cd
 \family default
  command, along with a persistent bookmark system (using 
 \family typewriter
 %bookmark
 \family default
 ) for fast access to frequently visited directories.
 \end_layout
 
 \begin_layout Itemize
 A lightweight persistence framework via the 
 \family typewriter
 %store
 \family default
  command, which allows you to save arbitrary Python variables.
  These get restored automatically when your session restarts.
 \end_layout
 
 \begin_layout Itemize
 Automatic indentation (optional) of code as you type (through the readline
  library).
 \end_layout
 
 \begin_layout Itemize
 Macro system for quickly re-executing multiple lines of previous input with
  a single name.
  Macros can be stored persistently via 
 \family typewriter
 %store
 \family default
  and edited via 
 \family typewriter
 %edit
 \family default
 .
  
 \end_layout
 
 \begin_layout Itemize
 Session logging (you can then later use these logs as code in your programs).
  Logs can optionally timestamp all input, and also store session output
  (marked as comments, so the log remains valid Python source code).
 \end_layout
 
 \begin_layout Itemize
 Session restoring: logs can be replayed to restore a previous session to
  the state where you left it.
 \end_layout
 
 \begin_layout Itemize
 Verbose and colored exception traceback printouts.
  Easier to parse visually, and in verbose mode they produce a lot of useful
  debugging information (basically a terminal version of the cgitb module).
 \end_layout
 
 \begin_layout Itemize
 Auto-parentheses: callable objects can be executed without parentheses:
  
 \family typewriter
 `sin 3'
 \family default
  is automatically converted to 
 \family typewriter
 `sin(3)
 \family default
 '.
 \end_layout
 
 \begin_layout Itemize
 Auto-quoting: using `
 \family typewriter
 ,
 \family default
 ' or `
 \family typewriter
 ;
 \family default
 ' as the first character forces auto-quoting of the rest of the line: 
 \family typewriter
 `,my_function a\InsetSpace ~
 b'
 \family default
  becomes automatically 
 \family typewriter
 `my_function("a","b")'
 \family default
 , while 
 \family typewriter
 `;my_function a\InsetSpace ~
 b'
 \family default
  becomes 
 \family typewriter
 `my_function("a b")'
 \family default
 .
 \end_layout
 
 \begin_layout Itemize
 Extensible input syntax.
  You can define filters that pre-process user input to simplify input in
  special situations.
  This allows for example pasting multi-line code fragments which start with
  
 \family typewriter
 `>>>'
 \family default
  or 
 \family typewriter
 `...'
 \family default
  such as those from other python sessions or the standard Python documentation.
 \end_layout
 
 \begin_layout Itemize
 Flexible configuration system.
  It uses a configuration file which allows permanent setting of all command-line
  options, module loading, code and file execution.
  The system allows recursive file inclusion, so you can have a base file
  with defaults and layers which load other customizations for particular
  projects.
 \end_layout
 
 \begin_layout Itemize
 Embeddable.
  You can call IPython as a python shell inside your own python programs.
  This can be used both for debugging code or for providing interactive abilities
  to your programs with knowledge about the local namespaces (very useful
  in debugging and data analysis situations).
 \end_layout
 
 \begin_layout Itemize
 Easy debugger access.
  You can set IPython to call up an enhanced version of the Python debugger
  (
 \family typewriter
 pdb
 \family default
 ) every time there is an uncaught exception.
  This drops you inside the code which triggered the exception with all the
  data live and it is possible to navigate the stack to rapidly isolate the
  source of a bug.
  The 
 \family typewriter
 %run
 \family default
  magic command --with the 
 \family typewriter
 -d
 \family default
  option-- can run any script under 
 \family typewriter
 pdb
 \family default
 's control, automatically setting initial breakpoints for you.
  This version of 
 \family typewriter
 pdb
 \family default
  has IPython-specific improvements, including tab-completion and traceback
  coloring support.
 \end_layout
 
 \begin_layout Itemize
 Profiler support.
  You can run single statements (similar to 
 \family typewriter
 profile.run()
 \family default
 ) or complete programs under the profiler's control.
  While this is possible with standard 
 \family typewriter
 cProfile
 \family default
  or 
 \family typewriter
 profile
 \family default
  modules, IPython wraps this functionality with magic commands (see 
 \family typewriter
 `%prun'
 \family default
  and 
 \family typewriter
 `%run -p
 \family default
 ') convenient for rapid interactive work.
 \end_layout
 
 \begin_layout Subsection
 Portability and Python requirements
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Python requirements: 
 \series default
 IPython requires with Python version 2.3 or newer.
  If you are still using Python 2.2 and can not upgrade, the last version
  of IPython which worked with Python 2.2 was 0.6.15, so you will have to use
  that.
 \end_layout
 
 \begin_layout Standard
 IPython is developed under 
 \series bold
 Linux
 \series default
 , but it should work in any reasonable Unix-type system (tested OK under
  Solaris and the *BSD family, for which a port exists thanks to Dryice Liu).
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Mac OS X
 \series default
 : it works, apparently without any problems (thanks to Jim Boyle at Lawrence
  Livermore for the information).
  Thanks to Andrea Riciputi, Fink support is available.
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 CygWin
 \series default
 : it works mostly OK, though some users have reported problems with prompt
  coloring.
  No satisfactory solution to this has been found so far, you may want to
  disable colors permanently in the 
 \family typewriter
 ipythonrc
 \family default
  configuration file if you experience problems.
  If you have proper color support under cygwin, please post to the IPython
  mailing list so this issue can be resolved for all users.
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Windows
 \series default
 : it works well under Windows XP/2k, and I suspect NT should behave similarly.
  Section\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sub:Under-Windows}
 
 \end_inset
 
  describes installation details for Windows, including some additional tools
  needed on this platform.
 \end_layout
 
 \begin_layout Standard
 Windows 9x support is present, and has been reported to work fine (at least
  on WinME).
 \end_layout
 
 \begin_layout Standard
 Note, that I have very little access to and experience with Windows development.
  However, an excellent group of Win32 users (led by Ville Vainio), consistently
  contribute bugfixes and platform-specific enhancements, so they more than
  make up for my deficiencies on that front.
  In fact, Win32 users report using IPython as a system shell (see Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:IPython-as-shell}
 
 \end_inset
 
  for details), as it offers a level of control and features which the default
  
 \family typewriter
 cmd.exe
 \family default
  doesn't provide.
 \end_layout
 
 \begin_layout Subsection
 Location
 \end_layout
 
 \begin_layout Standard
 IPython is generously hosted at 
 \begin_inset LatexCommand \htmlurl{http://ipython.scipy.org}
 
 \end_inset
 
  by the Enthought, Inc and the SciPy project.
  This site offers downloads, subversion access, mailing lists and a bug
  tracking system.
  I am very grateful to Enthought (
 \begin_inset LatexCommand \htmlurl{http://www.enthought.com}
 
 \end_inset
 
 ) and all of the SciPy team for their contribution.
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:install}
 
 \end_inset
 
 Installation
 \end_layout
 
 \begin_layout Subsection
 Instant instructions
 \end_layout
 
 \begin_layout Standard
 If you are of the impatient kind, under Linux/Unix simply untar/unzip the
  download, then install with 
 \family typewriter
 `python setup.py install'
 \family default
 .
  Under Windows, double-click on the provided 
 \family typewriter
 .exe
 \family default
  binary installer.
 \end_layout
 
 \begin_layout Standard
 Then, take a look at Sections 
 \begin_inset LatexCommand \ref{sec:good_config}
 
 \end_inset
 
  for configuring things optimally and 
 \begin_inset LatexCommand \ref{sec:quick_tips}
 
 \end_inset
 
  for quick tips on efficient use of IPython.
  You can later refer to the rest of the manual for all the gory details.
 \end_layout
 
 \begin_layout Standard
 See the notes in sec.
  
 \begin_inset LatexCommand \ref{sec:upgrade}
 
 \end_inset
 
  for upgrading IPython versions.
 \end_layout
 
 \begin_layout Subsection
 Detailed Unix instructions (Linux, Mac OS X, etc.)
 \end_layout
 
 \begin_layout Standard
 For RPM based systems, simply install the supplied package in the usual
  manner.
  If you download the tar archive, the process is:
 \end_layout
 
 \begin_layout Enumerate
 Unzip/untar the 
 \family typewriter
 ipython-XXX.tar.gz
 \family default
  file wherever you want (
 \family typewriter
 XXX
 \family default
  is the version number).
  It will make a directory called 
 \family typewriter
 ipython-XXX.
  
 \family default
 Change into that directory where you will find the files 
 \family typewriter
 README
 \family default
  and 
 \family typewriter
 setup.py
 \family default
 .
 
 \family typewriter
  O
 \family default
 nce you've completed the installation, you can safely remove this directory.
  
 \end_layout
 
 \begin_layout Enumerate
 If you are installing over a previous installation of version 0.2.0 or earlier,
  first remove your 
 \family typewriter
 $HOME/.ipython
 \family default
  directory, since the configuration file format has changed somewhat (the
  '=' were removed from all option specifications).
  Or you can call ipython with the 
 \family typewriter
 -upgrade
 \family default
  option and it will do this automatically for you.
 \end_layout
 
 \begin_layout Enumerate
 IPython uses distutils, so you can install it by simply typing at the system
  prompt (don't type the 
 \family typewriter
 $
 \family default
 )
 \newline
 
 \family typewriter
 $ python setup.py install
 \family default
 
 \newline
 Note that this assumes you have root access to your machine.
  If you don't have root access or don't want IPython to go in the default
  python directories, you'll need to use the 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|--home|
 \end_layout
 
 \end_inset
 
  option (or 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|--prefix|
 \end_layout
 
 \end_inset
 
 ).
  For example:
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|$ python setup.py install --home $HOME/local|
 \end_layout
 
 \end_inset
 
 
 \newline
 will install IPython into 
 \family typewriter
 $HOME/local 
 \family default
 and its subdirectories (creating them if necessary).
 \newline
 You can type
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|$ python setup.py --help|
 \end_layout
 
 \end_inset
 
  
 \newline
 for more details.
 \newline
 Note that if you change the default location for 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|--home|
 \end_layout
 
 \end_inset
 
  at installation, IPython may end up installed at a location which is not
  part of your 
 \family typewriter
 $PYTHONPATH
 \family default
  environment variable.
  In this case, you'll need to configure this variable to include the actual
  directory where the 
 \family typewriter
 IPython/
 \family default
  directory ended (typically the value you give to 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|--home|
 \end_layout
 
 \end_inset
 
  plus 
 \family typewriter
 /lib/python
 \family default
 ).
 \end_layout
 
 \begin_layout Subsubsection
 Mac OSX information
 \end_layout
 
 \begin_layout Standard
 Under OSX, there is a choice you need to make.
  Apple ships its own build of Python, which lives in the core OSX filesystem
  hierarchy.
  You can also manually install a separate Python, either purely by hand
  (typically in 
 \family typewriter
 /usr/local
 \family default
 ) or by using Fink, which puts everything under 
 \family typewriter
 /sw
 \family default
 .
  Which route to follow is a matter of personal preference, as I've seen
  users who favor each of the approaches.
  Here I will simply list the known installation issues under OSX, along
  with their solutions.
 \end_layout
 
 \begin_layout Standard
 This page: 
 \begin_inset LatexCommand \htmlurl{http://geosci.uchicago.edu/~tobis/pylab.html}
 
 \end_inset
 
  contains information on this topic, with additional details on how to make
  IPython and matplotlib play nicely under OSX.
 \end_layout
 
 \begin_layout Subsubsection*
 GUI problems
 \end_layout
 
 \begin_layout Standard
 The following instructions apply to an install of IPython under OSX from
  unpacking the 
 \family typewriter
 .tar.gz
 \family default
  distribution and installing it for the default Python interpreter shipped
  by Apple.
  If you are using a fink install, fink will take care of these details for
  you, by installing IPython against fink's Python.
 \end_layout
 
 \begin_layout Standard
 IPython offers various forms of support for interacting with graphical applicati
 ons from the command line, from simple Tk apps (which are in principle always
  supported by Python) to interactive control of WX, Qt and GTK apps.
  Under OSX, however, this requires that ipython is installed by calling
  the special 
 \family typewriter
 pythonw
 \family default
  script at installation time, which takes care of coordinating things with
  Apple's graphical environment.
 \end_layout
 
 \begin_layout Standard
 So when installing under OSX, it is best to use the following command:
 \family typewriter
 
 \newline
 
 \family default
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|  $ sudo pythonw setup.py install --install-scripts=/usr/local/bin|
 \end_layout
 
 \end_inset
 
 
 \newline
  or
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|  $ sudo pythonw setup.py install --install-scripts=/usr/bin|
 \end_layout
 
 \end_inset
 
 
 \newline
 depending on where you like to keep hand-installed executables.
 \end_layout
 
 \begin_layout Standard
 The resulting script will have an appropriate shebang line (the first line
  in the script whic begins with 
 \family typewriter
 #!...
 \family default
 ) such that the ipython interpreter can interact with the OS X GUI.
  If the installed version does not work and has a shebang line that points
  to, for example, just 
 \family typewriter
 /usr/bin/python
 \family default
 , then you might have a stale, cached version in your 
 \family typewriter
 build/scripts-<python-version>
 \family default
  directory.
  Delete that directory and rerun the 
 \family typewriter
 setup.py
 \family default
 .
  
 \end_layout
 
 \begin_layout Standard
 It is also a good idea to use the special flag 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 verb|--install-scripts|
 \end_layout
 
 \end_inset
 
  as indicated above, to ensure that the ipython scripts end up in a location
  which is part of your 
 \family typewriter
 $PATH
 \family default
 .
  Otherwise Apple's Python will put the scripts in an internal directory
  not available by default at the command line (if you use 
 \family typewriter
 /usr/local/bin
 \family default
 , you need to make sure this is in your 
 \family typewriter
 $PATH
 \family default
 , which may not be true by default).
 \end_layout
 
 \begin_layout Subsubsection*
 Readline problems
 \end_layout
 
 \begin_layout Standard
 By default, the Python version shipped by Apple does 
 \emph on
 not
 \emph default
  include the readline library, so central to IPython's behavior.
  If you install IPython against Apple's Python, you will not have arrow
  keys, tab completion, etc.
  For Mac OSX 10.3 (Panther), you can find a prebuilt readline library here:
 \newline
 
 \begin_inset LatexCommand \htmlurl{http://pythonmac.org/packages/readline-5.0-py2.3-macosx10.3.zip}
 
 \end_inset
 
  
 \end_layout
 
 \begin_layout Standard
 If you are using OSX 10.4 (Tiger), after installing this package you need
  to either: 
 \end_layout
 
 \begin_layout Enumerate
 move 
 \family typewriter
 readline.so
 \family default
  from 
 \family typewriter
 /Library/Python/2.3
 \family default
  to 
 \family typewriter
 /Library/Python/2.3/site-packages
 \family default
 , or
 \end_layout
 
 \begin_layout Enumerate
 install 
 \begin_inset LatexCommand \htmlurl{http://pythonmac.org/packages/TigerPython23Compat.pkg.zip}
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Standard
 Users installing against Fink's Python or a properly hand-built one should
  not have this problem.
 \end_layout
 
 \begin_layout Subsubsection*
 DarwinPorts
 \end_layout
 
 \begin_layout Standard
 I report here a message from an OSX user, who suggests an alternative means
  of using IPython under this operating system with good results.
  Please let me know of any updates that may be useful for this section.
  His message is reproduced verbatim below:
 \end_layout
 
 \begin_layout Quote
 From: Markus Banfi 
 \family typewriter
 <markus.banfi-AT-mospheira.net>
 \end_layout
 
 \begin_layout Quote
 As a MacOS X (10.4.2) user I prefer to install software using DawinPorts instead
  of Fink.
  I had no problems installing ipython with DarwinPorts.
  It's just:
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 sudo port install py-ipython
 \end_layout
 
 \begin_layout Quote
 It automatically resolved all dependencies (python24, readline, py-readline).
  So far I did not encounter any problems with the DarwinPorts port of ipython.
  
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sub:Under-Windows}
 
 \end_inset
 
 Windows instructions
 \end_layout
 
 \begin_layout Standard
 Some of IPython's very useful features are:
 \end_layout
 
 \begin_layout Itemize
 Integrated readline support (Tab-based file, object and attribute completion,
  input history across sessions, editable command line, etc.)
 \end_layout
 
 \begin_layout Itemize
 Coloring of prompts, code and tracebacks.
 \end_layout
 
 \begin_layout Standard
 These, by default, are only available under Unix-like operating systems.
  However, thanks to Gary Bishop's work, Windows XP/2k users can also benefit
  from them.
  His readline library originally implemented both GNU readline functionality
  and color support, so that IPython under Windows XP/2k can be as friendly
  and powerful as under Unix-like environments.
  
 \end_layout
 
 \begin_layout Standard
 This library, now named 
 \family typewriter
 PyReadline
 \family default
 , has been absorbed by the IPython team (J�rgen Stenarson, in particular),
  and it continues to be developed with new features, as well as being distribute
 d directly from the IPython site.
 \end_layout
 
 \begin_layout Standard
 The
 \family typewriter
  PyReadline
 \family default
  extension requires 
 \family typewriter
 CTypes
 \family default
  and the windows IPython installer needs 
 \family typewriter
 PyWin32
 \family default
 , so in all you need:
 \end_layout
 
 \begin_layout Enumerate
 
 \family typewriter
 PyWin32
 \family default
  from 
 \begin_inset LatexCommand \htmlurl{http://sourceforge.net/projects/pywin32}
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Enumerate
 
 \family typewriter
 PyReadline
 \family default
  for Windows from 
 \begin_inset LatexCommand \htmlurl{http://ipython.scipy.org/moin/PyReadline/Intro}
 
 \end_inset
 
 .
  That page contains further details on using and configuring the system
  to your liking.
 \end_layout
 
 \begin_layout Enumerate
 Finally, 
 \emph on
 only 
 \emph default
 if you are using Python 2.3 or 2.4, you need 
 \family typewriter
 CTypes
 \family default
  from 
 \begin_inset LatexCommand \htmlurl{http://starship.python.net/crew/theller/ctypes}
 
 \end_inset
 
  (you 
 \emph on
 must
 \emph default
  use version 0.9.1 or newer).
  This package is included in Python 2.5, so you don't need to manually get
  it if your Python version is 2.5 or newer.
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Warning about a broken readline-like library:
 \series default
  several users have reported problems stemming from using the pseudo-readline
  library at 
 \begin_inset LatexCommand \htmlurl{http://newcenturycomputers.net/projects/readline.html}
 
 \end_inset
 
 .
  This is a broken library which, while called readline, only implements
  an incomplete subset of the readline API.
  Since it is still called readline, it fools IPython's detection mechanisms
  and causes unpredictable crashes later.
  If you wish to use IPython under Windows, you must NOT use this library,
  which for all purposes is (at least as of version 1.6) terminally broken.
 \end_layout
 
 \begin_layout Subsubsection
 Installation procedure
 \end_layout
 
 \begin_layout Standard
 Once you have the above installed, from the IPython download directory grab
  the 
 \family typewriter
 ipython-XXX.win32.exe
 \family default
  file, where 
 \family typewriter
 XXX
 \family default
  represents the version number.
  This is a regular windows executable installer, which you can simply double-cli
 ck to install.
  It will add an entry for IPython to your Start Menu, as well as registering
  IPython in the Windows list of applications, so you can later uninstall
  it from the Control Panel.
  
 \end_layout
 
 \begin_layout Standard
 IPython tries to install the configuration information in a directory named
  
 \family typewriter
 .ipython
 \family default
  (
 \family typewriter
 _ipython
 \family default
  under Windows) located in your `home' directory.
  IPython sets this directory by looking for a 
 \family typewriter
 HOME
 \family default
  environment variable; if such a variable does not exist, it uses 
 \family typewriter
 HOMEDRIVE
 \backslash
 HOMEPATH 
 \family default
 (these are always defined by Windows).
  This typically gives something like 
 \family typewriter
 C:
 \backslash
 Documents and Settings
 \backslash
 YourUserName
 \family default
 , but your local details may vary.
  In this directory you will find all the files that configure IPython's
  defaults, and you can put there your profiles and extensions.
  This directory is automatically added by IPython to 
 \family typewriter
 sys.path
 \family default
 , so anything you place there can be found by 
 \family typewriter
 import
 \family default
  statements.
 \end_layout
 
 \begin_layout Paragraph
 Upgrading
 \end_layout
 
 \begin_layout Standard
 For an IPython upgrade, you should first uninstall the previous version.
  This will ensure that all files and directories (such as the documentation)
  which carry embedded version strings in their names are properly removed.
 \end_layout
 
 \begin_layout Paragraph
 Manual installation under Win32
 \end_layout
 
 \begin_layout Standard
 In case the automatic installer does not work for some reason, you can download
  the 
 \family typewriter
 ipython-XXX.tar.gz
 \family default
  file, which contains the full IPython source distribution (the popular
  WinZip can read 
 \family typewriter
 .tar.gz
 \family default
  files).
  After uncompressing the archive, you can install it at a command terminal
  just like any other Python module, by using 
 \family typewriter
 `python setup.py install'
 \family default
 .
  
 \end_layout
 
 \begin_layout Standard
 After the installation, run the supplied 
 \family typewriter
 win32_manual_post_install.py 
 \family default
 script, which creates the necessary Start Menu shortcuts for you.
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:upgrade}
 
 \end_inset
 
 Upgrading from a previous version
 \end_layout
 
 \begin_layout Standard
 If you are upgrading from a previous version of IPython, after doing the
  routine installation described above, you should call IPython with the
  
 \family typewriter
 -upgrade
 \family default
  option the first time you run your new copy.
  This will automatically update your configuration directory while preserving
  copies of your old files.
  You can then later merge back any personal customizations you may have
  made into the new files.
  It is a good idea to do this as there may be new options available in the
  new configuration files which you will not have.
 \end_layout
 
 \begin_layout Standard
 Under Windows, if you don't know how to call python scripts with arguments
  from a command line, simply delete the old config directory and IPython
  will make a new one.
  Win2k and WinXP users will find it in 
 \family typewriter
 C:
 \backslash
 Documents and Settings
 \backslash
 YourUserName
 \backslash
 _ipython
 \family default
 , and Win 9x users under 
 \family typewriter
 C:
 \backslash
 Program Files
 \backslash
 IPython
 \backslash
 _ipython.
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:good_config}
 
 \end_inset
 
 
 \begin_inset OptArg
 status collapsed
 
 \begin_layout Standard
 Initial configuration
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 ldots
 \end_layout
 
 \end_inset
 
 
 \end_layout
 
 \end_inset
 
 Initial configuration of your environment
 \end_layout
 
 \begin_layout Standard
 This section will help you set various things in your environment for your
  IPython sessions to be as efficient as possible.
  All of IPython's configuration information, along with several example
  files, is stored in a directory named by default 
 \family typewriter
 $HOME/.ipython
 \family default
 .
  You can change this by defining the environment variable 
 \family typewriter
 IPYTHONDIR
 \family default
 , or at runtime with the command line option 
 \family typewriter
 -ipythondir
 \family default
 .
 \end_layout
 
 \begin_layout Standard
 If all goes well, the first time you run IPython it should automatically
  create a user copy of the config directory for you, based on its builtin
  defaults.
  You can look at the files it creates to learn more about configuring the
  system.
  The main file you will modify to configure IPython's behavior is called
  
 \family typewriter
 ipythonrc
 \family default
  (with a 
 \family typewriter
 .ini
 \family default
  extension under Windows), included for reference in Sec.
  
 \begin_inset LatexCommand \ref{sec:ipytonrc-sample}
 
 \end_inset
 
 .
  This file is very commented and has many variables you can change to suit
  your taste, you can find more details in Sec.
  
 \begin_inset LatexCommand \ref{sec:customization}
 
 \end_inset
 
 .
  Here we discuss the basic things you will want to make sure things are
  working properly from the beginning.
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:help-access}
 
 \end_inset
 
 Access to the Python help system
 \end_layout
 
 \begin_layout Standard
 This is true for Python in general (not just for IPython): you should have
  an environment variable called 
 \family typewriter
 PYTHONDOCS
 \family default
  pointing to the directory where your HTML Python documentation lives.
  In my system it's 
 \family typewriter
 /usr/share/doc/python-docs-2.3.4/html
 \family default
 , check your local details or ask your systems administrator.
  
 \end_layout
 
 \begin_layout Standard
 This is the directory which holds the HTML version of the Python manuals.
  Unfortunately it seems that different Linux distributions package these
  files differently, so you may have to look around a bit.
  Below I show the contents of this directory on my system for reference:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 [html]> ls
 \newline
 about.dat acks.html dist/ ext/ index.html lib/ modindex.html stdabout.dat
  tut/ about.html api/ doc/ icons/ inst/ mac/ ref/ style.css
 \end_layout
 
 \begin_layout Standard
 You should really make sure this variable is correctly set so that Python's
  pydoc-based help system works.
  It is a powerful and convenient system with full access to the Python manuals
  and all modules accessible to you.
 \end_layout
 
 \begin_layout Standard
 Under Windows it seems that pydoc finds the documentation automatically,
  so no extra setup appears necessary.
 \end_layout
 
 \begin_layout Subsection
 Editor
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 %edit
 \family default
  command (and its alias 
 \family typewriter
 %ed
 \family default
 ) will invoke the editor set in your environment as 
 \family typewriter
 EDITOR
 \family default
 .
  If this variable is not set, it will default to 
 \family typewriter
 vi
 \family default
  under Linux/Unix and to 
 \family typewriter
 notepad
 \family default
  under Windows.
  You may want to set this variable properly and to a lightweight editor
  which doesn't take too long to start (that is, something other than a new
  instance of 
 \family typewriter
 Emacs
 \family default
 ).
  This way you can edit multi-line code quickly and with the power of a real
  editor right inside IPython.
  
 \end_layout
 
 \begin_layout Standard
 If you are a dedicated 
 \family typewriter
 Emacs
 \family default
  user, you should set up the 
 \family typewriter
 Emacs
 \family default
  server so that new requests are handled by the original process.
  This means that almost no time is spent in handling the request (assuming
  an 
 \family typewriter
 Emacs
 \family default
  process is already running).
  For this to work, you need to set your 
 \family typewriter
 EDITOR 
 \family default
 environment variable to 
 \family typewriter
 'emacsclient'
 \family default
 .
 
 \family typewriter
  
 \family default
 The code below, supplied by Francois Pinard, can then be used in your 
 \family typewriter
 .emacs
 \family default
  file to enable the server:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 (defvar server-buffer-clients)
 \newline
 (when (and (fboundp 'server-start) (string-equal
  (getenv "TERM") 'xterm))
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 (server-start)
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 (defun fp-kill-server-with-buffer-routine ()
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 (and server-buffer-clients (server-done)))
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 (add-hook 'kill-buffer-hook 'fp-kill-server-with-buffer-routine))
 \end_layout
 
 \begin_layout Standard
 You can also set the value of this editor via the commmand-line option '-
 \family typewriter
 editor'
 \family default
  or in your 
 \family typewriter
 ipythonrc
 \family default
  file.
  This is useful if you wish to use specifically for IPython an editor different
  from your typical default (and for Windows users who tend to use fewer
  environment variables).
 \end_layout
 
 \begin_layout Subsection
 Color 
 \end_layout
 
 \begin_layout Standard
 The default IPython configuration has most bells and whistles turned on
  (they're pretty safe).
  But there's one that 
 \emph on
 may
 \emph default
  cause problems on some systems: the use of color on screen for displaying
  information.
  This is very useful, since IPython can show prompts and exception tracebacks
  with various colors, display syntax-highlighted source code, and in general
  make it easier to visually parse information.
 \end_layout
 
 \begin_layout Standard
 The following terminals seem to handle the color sequences fine:
 \end_layout
 
 \begin_layout Itemize
 Linux main text console, KDE Konsole, Gnome Terminal, E-term, rxvt, xterm.
 \end_layout
 
 \begin_layout Itemize
 CDE terminal (tested under Solaris).
  This one boldfaces light colors.
 \end_layout
 
 \begin_layout Itemize
 (X)Emacs buffers.
  See sec.
 \begin_inset LatexCommand \ref{sec:emacs}
 
 \end_inset
 
  for more details on using IPython with (X)Emacs.
 \end_layout
 
 \begin_layout Itemize
 A Windows (XP/2k) command prompt 
 \emph on
 with Gary Bishop's support extensions
 \emph default
 .
  Gary's extensions are discussed in Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sub:Under-Windows}
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Itemize
 A Windows (XP/2k) CygWin shell.
  Although some users have reported problems; it is not clear whether there
  is an issue for everyone or only under specific configurations.
  If you have full color support under cygwin, please post to the IPython
  mailing list so this issue can be resolved for all users.
 \end_layout
 
 \begin_layout Standard
 These have shown problems:
 \end_layout
 
 \begin_layout Itemize
 Windows command prompt in WinXP/2k logged into a Linux machine via telnet
  or ssh.
 \end_layout
 
 \begin_layout Itemize
 Windows native command prompt in WinXP/2k, 
 \emph on
 without 
 \emph default
 Gary Bishop's extensions.
  Once Gary's readline library is installed, the normal WinXP/2k command
  prompt works perfectly.
 \end_layout
 
 \begin_layout Standard
 Currently the following color schemes are available:
 \end_layout
 
 \begin_layout Itemize
 
 \family typewriter
 NoColor
 \family default
 : uses no color escapes at all (all escapes are empty 
 \begin_inset Quotes eld
 \end_inset
 
  
 \begin_inset Quotes eld
 \end_inset
 
  strings).
  This 'scheme' is thus fully safe to use in any terminal.
 \end_layout
 
 \begin_layout Itemize
 
 \family typewriter
 Linux
 \family default
 : works well in Linux console type environments: dark background with light
  fonts.
  It uses bright colors for information, so it is difficult to read if you
  have a light colored background.
 \end_layout
 
 \begin_layout Itemize
 
 \family typewriter
 LightBG
 \family default
 : the basic colors are similar to those in the 
 \family typewriter
 Linux
 \family default
  scheme but darker.
  It is easy to read in terminals with light backgrounds.
 \end_layout
 
 \begin_layout Standard
 IPython uses colors for two main groups of things: prompts and tracebacks
  which are directly printed to the terminal, and the object introspection
  system which passes large sets of data through a pager.
 \end_layout
 
 \begin_layout Subsubsection
 Input/Output prompts and exception tracebacks
 \end_layout
 
 \begin_layout Standard
 You can test whether the colored prompts and tracebacks work on your system
  interactively by typing 
 \family typewriter
 '%colors Linux'
 \family default
  at the prompt (use '
 \family typewriter
 %colors LightBG'
 \family default
  if your terminal has a light background).
  If the input prompt shows garbage like:
 \newline
 
 \family typewriter
 [0;32mIn [[1;32m1[0;32m]: [0;00m
 \family default
 
 \newline
 instead of (in color) something like:
 \newline
 
 \family typewriter
 In [1]:
 \family default
  
 \newline
 this means that your terminal doesn't properly handle color escape sequences.
  You can go to a 'no color' mode by typing '
 \family typewriter
 %colors NoColor
 \family default
 '.
  
 \end_layout
 
 \begin_layout Standard
 You can try using a different terminal emulator program (Emacs users, see
  below).
  To permanently set your color preferences, edit the file
 \family typewriter
  $HOME/.ipython/ipythonrc 
 \family default
 and set the 
 \family typewriter
 colors
 \family default
  option to the desired value.
 \end_layout
 
 \begin_layout Subsubsection
 Object details (types, docstrings, source code, etc.)
 \end_layout
 
 \begin_layout Standard
 IPython has a set of special functions for studying the objects you are
  working with, discussed in detail in Sec.
  
 \begin_inset LatexCommand \ref{sec:dyn-object-info}
 
 \end_inset
 
 .
  But this system relies on passing information which is longer than your
  screen through a data pager, such as the common Unix 
 \family typewriter
 less
 \family default
  and 
 \family typewriter
 more
 \family default
  programs.
  In order to be able to see this information in color, your pager needs
  to be properly configured.
  I strongly recommend using 
 \family typewriter
 less
 \family default
  instead of 
 \family typewriter
 more
 \family default
 , as it seems that 
 \family typewriter
 more
 \family default
  simply can not understand colored text correctly.
 \end_layout
 
 \begin_layout Standard
 In order to configure 
 \family typewriter
 less
 \family default
  as your default pager, do the following:
 \end_layout
 
 \begin_layout Enumerate
 Set the environment 
 \family typewriter
 PAGER
 \family default
  variable to 
 \family typewriter
 less
 \family default
 .
 \end_layout
 
 \begin_layout Enumerate
 Set the environment 
 \family typewriter
 LESS
 \family default
  variable to 
 \family typewriter
 -r
 \family default
  (plus any other options you always want to pass to 
 \family typewriter
 less
 \family default
  by default).
  This tells 
 \family typewriter
 less
 \family default
  to properly interpret control sequences, which is how color information
  is given to your terminal.
 \end_layout
 
 \begin_layout Standard
 For the 
 \family typewriter
 csh
 \family default
  or 
 \family typewriter
 tcsh
 \family default
  shells, add to your 
 \family typewriter
 ~/.cshrc
 \family default
  file the lines:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 setenv PAGER less
 \newline
 setenv LESS -r
 \end_layout
 
 \begin_layout Standard
 There is similar syntax for other Unix shells, look at your system documentation
  for details.
 \end_layout
 
 \begin_layout Standard
 If you are on a system which lacks proper data pagers (such as Windows),
  IPython will use a very limited builtin pager.
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:emacs}
 
 \end_inset
 
 (X)Emacs configuration
 \end_layout
 
 \begin_layout Standard
 Thanks to the work of Alexander Schmolck and Prabhu Ramachandran, currently
  (X)Emacs and IPython get along very well.
  
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Important note:
 \series default
  You will need to use a recent enough version of 
 \family typewriter
 python-mode.el
 \family default
 , along with the file 
 \family typewriter
 ipython.el
 \family default
 .
  You can check that the version you have of 
 \family typewriter
 python-mode.el
 \family default
  is new enough by either looking at the revision number in the file itself,
  or asking for it in (X)Emacs via 
 \family typewriter
 M-x py-version
 \family default
 .
  Versions 4.68 and newer contain the necessary fixes for proper IPython support.
 \end_layout
 
 \begin_layout Standard
 The file 
 \family typewriter
 ipython.el
 \family default
  is included with the IPython distribution, in the documentation directory
  (where this manual resides in PDF and HTML formats).
 \end_layout
 
 \begin_layout Standard
 Once you put these files in your Emacs path, all you need in your 
 \family typewriter
 .emacs
 \family default
  file is:
 \end_layout
 
 \begin_layout LyX-Code
 (require 'ipython)
 \end_layout
 
 \begin_layout Standard
 This should give you full support for executing code snippets via IPython,
  opening IPython as your Python shell via 
 \family typewriter
 C-c\InsetSpace ~
 !
 \family default
 , etc.
  
 \end_layout
 
 \begin_layout Standard
 If you happen to get garbage instead of colored prompts as described in
  the previous section, you may need to set also in your 
 \family typewriter
 .emacs
 \family default
  file:
 \end_layout
 
 \begin_layout LyX-Code
 (setq ansi-color-for-comint-mode t)
 \end_layout
 
 \begin_layout Subsubsection*
 Notes
 \end_layout
 
 \begin_layout Itemize
 There is one caveat you should be aware of: you must start the IPython shell
  
 \emph on
 before
 \emph default
  attempting to execute any code regions via 
 \family typewriter
 C-c\InsetSpace ~
 |
 \family default
 .
  Simply type 
 \family typewriter
 C-c\InsetSpace ~
 !
 \family default
  to start IPython before passing any code regions to the interpreter, and
  you shouldn't experience any problems.
 \newline
 This is due to a bug in Python itself,
  which has been fixed for Python 2.3, but exists as of Python 2.2.2 (reported
  as SF bug [ 737947 ]).
 \end_layout
 
 \begin_layout Itemize
 The (X)Emacs support is maintained by Alexander Schmolck, so all comments/reques
 ts should be directed to him through the IPython mailing lists.
  
 \end_layout
 
 \begin_layout Itemize
 This code is still somewhat experimental so it's a bit rough around the
  edges (although in practice, it works quite well).
 \end_layout
 
 \begin_layout Itemize
 Be aware that if you customize 
 \family typewriter
 py-python-command
 \family default
  previously, this value will override what 
 \family typewriter
 ipython.el
 \family default
  does (because loading the customization variables comes later).
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:quick_tips}
 
 \end_inset
 
 Quick tips
 \end_layout
 
 \begin_layout Standard
 IPython can be used as an improved replacement for the Python prompt, and
  for that you don't really need to read any more of this manual.
  But in this section we'll try to summarize a few tips on how to make the
  most effective use of it for everyday Python development, highlighting
  things you might miss in the rest of the manual (which is getting long).
  We'll give references to parts in the manual which provide more detail
  when appropriate.
 \end_layout
 
 \begin_layout Standard
 The following article by Jeremy Jones provides an introductory tutorial
  about IPython:
 \newline
 
 \begin_inset LatexCommand \htmlurl{http://www.onlamp.com/pub/a/python/2005/01/27/ipython.html}
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Itemize
 The TAB key.
  TAB-completion, especially for attributes, is a convenient way to explore
  the structure of any object you're dealing with.
  Simply type 
 \family typewriter
 object_name.<TAB>
 \family default
  and a list of the object's attributes will be printed (see sec.
  
 \begin_inset LatexCommand \ref{sec:readline}
 
 \end_inset
 
  for more).
  Tab completion also works on file and directory names, which combined with
  IPython's alias system allows you to do from within IPython many of the
  things you normally would need the system shell for.
  
 \end_layout
 
 \begin_layout Itemize
 Explore your objects.
  Typing 
 \family typewriter
 object_name?
 \family default
  will print all sorts of details about any object, including docstrings,
  function definition lines (for call arguments) and constructor details
  for classes.
  The magic commands 
 \family typewriter
 %pdoc
 \family default
 , 
 \family typewriter
 %pdef
 \family default
 , 
 \family typewriter
 %psource
 \family default
  and 
 \family typewriter
 %pfile
 \family default
  will respectively print the docstring, function definition line, full source
  code and the complete file for any object (when they can be found).
  If automagic is on (it is by default), you don't need to type the '
 \family typewriter
 %
 \family default
 ' explicitly.
  See sec.
  
 \begin_inset LatexCommand \ref{sec:dyn-object-info}
 
 \end_inset
 
  for more.
 \end_layout
 
 \begin_layout Itemize
 The 
 \family typewriter
 %run
 \family default
  magic command allows you to run any python script and load all of its data
  directly into the interactive namespace.
  Since the file is re-read from disk each time, changes you make to it are
  reflected immediately (in contrast to the behavior of 
 \family typewriter
 import
 \family default
 ).
  I rarely use 
 \family typewriter
 import
 \family default
  for code I am testing, relying on 
 \family typewriter
 %run
 \family default
  instead.
  See sec.
  
 \begin_inset LatexCommand \ref{sec:magic}
 
 \end_inset
 
  for more on this and other magic commands, or type the name of any magic
  command and ? to get details on it.
  See also sec.
  
 \begin_inset LatexCommand \ref{sec:dreload}
 
 \end_inset
 
  for a recursive reload command.
 \newline
 
 \family typewriter
 %run
 \family default
  also has special flags for timing the execution of your scripts (
 \family typewriter
 -t
 \family default
 ) and for executing them under the control of either Python's 
 \family typewriter
 pdb 
 \family default
 debugger (
 \family typewriter
 -d
 \family default
 ) or profiler (
 \family typewriter
 -p
 \family default
 ).
  With all of these, 
 \family typewriter
 %run
 \family default
  can be used as the main tool for efficient interactive development of code
  which you write in your editor of choice.
 \end_layout
 
 \begin_layout Itemize
 Use the Python debugger, 
 \family typewriter
 pdb
 \family default
 
 \begin_inset Foot
 status collapsed
 
 \begin_layout Standard
 Thanks to Christian Hart and Matthew Arnison for the suggestions leading
  to IPython's improved debugger and profiler support.
 \end_layout
 
 \end_inset
 
 .
  The 
 \family typewriter
 %pdb
 \family default
  command allows you to toggle on and off the automatic invocation of an
  IPython-enhanced 
 \family typewriter
 pdb
 \family default
  debugger (with coloring, tab completion and more) at any uncaught exception.
  The advantage of this is that 
 \family typewriter
 pdb
 \family default
  starts 
 \emph on
 inside
 \emph default
  the function where the exception occurred, with all data still available.
  You can print variables, see code, execute statements and even walk up
  and down the call stack to track down the true source of the problem (which
  often is many layers in the stack above where the exception gets triggered).
 \newline
 Runn
 ing programs with 
 \family typewriter
 %run
 \family default
  and pdb active can be an efficient to develop and debug code, in many cases
  eliminating the need for 
 \family typewriter
 print
 \family default
  statements or external debugging tools.
  I often simply put a 
 \family typewriter
 1/0
 \family default
  in a place where I want to take a look so that pdb gets called, quickly
  view whatever variables I need to or test various pieces of code and then
  remove the 
 \family typewriter
 1/0
 \family default
 .
 \newline
 Note also that `
 \family typewriter
 %run -d
 \family default
 ' activates 
 \family typewriter
 pdb
 \family default
  and automatically sets initial breakpoints for you to step through your
  code, watch variables, etc.
  See Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:cache_output}
 
 \end_inset
 
  for details.
 \end_layout
 
 \begin_layout Itemize
 Use the output cache.
  All output results are automatically stored in a global dictionary named
  
 \family typewriter
 Out
 \family default
  and variables named 
 \family typewriter
 _1
 \family default
 , 
 \family typewriter
 _2
 \family default
 , etc.
  alias them.
  For example, the result of input line 4 is available either as 
 \family typewriter
 Out[4]
 \family default
  or as 
 \family typewriter
 _4
 \family default
 .
  Additionally, three variables named 
 \family typewriter
 _
 \family default
 , 
 \family typewriter
 __
 \family default
  and 
 \family typewriter
 ___
 \family default
  are always kept updated with the for the last three results.
  This allows you to recall any previous result and further use it for new
  calculations.
  See Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:cache_output}
 
 \end_inset
 
  for more.
 \end_layout
 
 \begin_layout Itemize
 Put a '
 \family typewriter
 ;
 \family default
 ' at the end of a line to supress the printing of output.
  This is useful when doing calculations which generate long output you are
  not interested in seeing.
  The 
 \family typewriter
 _*
 \family default
  variables and the 
 \family typewriter
 Out[]
 \family default
  list do get updated with the contents of the output, even if it is not
  printed.
  You can thus still access the generated results this way for further processing.
 \end_layout
 
 \begin_layout Itemize
 A similar system exists for caching input.
  All input is stored in a global list called 
 \family typewriter
 In
 \family default
  , so you can re-execute lines 22 through 28 plus line 34 by typing 
 \family typewriter
 'exec In[22:29]+In[34]'
 \family default
  (using Python slicing notation).
  If you need to execute the same set of lines often, you can assign them
  to a macro with the 
 \family typewriter
 %macro
 \family default
  
 \family typewriter
 function.
  
 \family default
 See sec.
  
 \begin_inset LatexCommand \ref{sec:cache_input}
 
 \end_inset
 
  for more.
 \end_layout
 
 \begin_layout Itemize
 Use your input history.
  The 
 \family typewriter
 %hist
 \family default
  command can show you all previous input, without line numbers if desired
  (option 
 \family typewriter
 -n
 \family default
 ) so you can directly copy and paste code either back in IPython or in a
  text editor.
  You can also save all your history by turning on logging via 
 \family typewriter
 %logstart
 \family default
 ; these logs can later be either reloaded as IPython sessions or used as
  code for your programs.
 \end_layout
 
 \begin_layout Itemize
 Define your own system aliases.
  Even though IPython gives you access to your system shell via the 
 \family typewriter
 !
 \family default
  prefix, it is convenient to have aliases to the system commands you use
  most often.
  This allows you to work seamlessly from inside IPython with the same commands
  you are used to in your system shell.
 \newline
 IPython comes with some pre-defined
  aliases and a complete system for changing directories, both via a stack
  (see 
 \family typewriter
 %pushd
 \family default
 , 
 \family typewriter
 %popd
 \family default
  and 
 \family typewriter
 %dhist
 \family default
 ) and via direct 
 \family typewriter
 %cd
 \family default
 .
  The latter keeps a history of visited directories and allows you to go
  to any previously visited one.
 \end_layout
 
 \begin_layout Itemize
 Use Python to manipulate the results of system commands.
  The `
 \family typewriter
 !!
 \family default
 ' special syntax, and the 
 \family typewriter
 %sc
 \family default
  and 
 \family typewriter
 %sx
 \family default
  magic commands allow you to capture system output into Python variables.
 \end_layout
 
 \begin_layout Itemize
 Expand python variables when calling the shell (either via 
 \family typewriter
 `!'
 \family default
  and 
 \family typewriter
 `!!'
 \family default
  or via aliases) by prepending a 
 \family typewriter
 $
 \family default
  in front of them.
  You can also expand complete python expressions.
  See sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sub:System-shell-access}
 
 \end_inset
 
  for more.
 \end_layout
 
 \begin_layout Itemize
 Use profiles to maintain different configurations (modules to load, function
  definitions, option settings) for particular tasks.
  You can then have customized versions of IPython for specific purposes.
  See sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:profiles}
 
 \end_inset
 
  for more.
 \end_layout
 
 \begin_layout Itemize
 Embed IPython in your programs.
  A few lines of code are enough to load a complete IPython inside your own
  programs, giving you the ability to work with your data interactively after
  automatic processing has been completed.
  See sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:embed}
 
 \end_inset
 
  for more.
 \end_layout
 
 \begin_layout Itemize
 Use the Python profiler.
  When dealing with performance issues, the 
 \family typewriter
 %run
 \family default
  command with a 
 \family typewriter
 -p
 \family default
  option allows you to run complete programs under the control of the Python
  profiler.
  The 
 \family typewriter
 %prun
 \family default
  command does a similar job for single Python expressions (like function
  calls).
 \end_layout
 
 \begin_layout Itemize
 Use the IPython.demo.Demo class to load any Python script as an interactive
  demo.
  With a minimal amount of simple markup, you can control the execution of
  the script, stopping as needed.
  See sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:interactive-demos}
 
 \end_inset
 
  for more.
 \end_layout
 
 \begin_layout Subsection
 Source code handling tips
 \end_layout
 
 \begin_layout Standard
 IPython is a line-oriented program, without full control of the terminal.
  Therefore, it doesn't support true multiline editing.
  However, it has a number of useful tools to help you in dealing effectively
  with more complex editing.
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 %edit
 \family default
  command gives a reasonable approximation of multiline editing, by invoking
  your favorite editor on the spot.
  IPython will execute the code you type in there as if it were typed interactive
 ly.
  Type 
 \family typewriter
 %edit?
 \family default
  for the full details on the edit command.
 \end_layout
 
 \begin_layout Standard
 If you have typed various commands during a session, which you'd like to
  reuse, IPython provides you with a number of tools.
  Start by using 
 \family typewriter
 %hist
 \family default
  to see your input history, so you can see the line numbers of all input.
  Let us say that you'd like to reuse lines 10 through 20, plus lines 24
  and 28.
  All the commands below can operate on these with the syntax
 \end_layout
 
 \begin_layout LyX-Code
 %command 10-20 24 28
 \end_layout
 
 \begin_layout Standard
 where the command given can be:
 \end_layout
 
 \begin_layout Itemize
 
 \family typewriter
 %macro <macroname>
 \family default
 : this stores the lines into a variable which, when called at the prompt,
  re-executes the input.
  Macros can be edited later using 
 \family typewriter
 `%edit macroname
 \family default
 ', and they can be stored persistently across sessions with `
 \family typewriter
 %store macroname
 \family default
 ' (the storage system is per-profile).
  The combination of quick macros, persistent storage and editing, allows
  you to easily refine quick-and-dirty interactive input into permanent utilities
 , always available both in IPython and as files for general reuse.
 \end_layout
 
 \begin_layout Itemize
 
 \family typewriter
 %edit
 \family default
 : this will open a text editor with those lines pre-loaded for further modificat
 ion.
  It will then execute the resulting file's contents as if you had typed
  it at the prompt.
 \end_layout
 
 \begin_layout Itemize
 
 \family typewriter
 %save <filename>
 \family default
 : this saves the lines directly to a named file on disk.
 \end_layout
 
 \begin_layout Standard
 While 
 \family typewriter
 %macro
 \family default
  saves input lines into memory for interactive re-execution, sometimes you'd
  like to save your input directly to a file.
  The 
 \family typewriter
 %save
 \family default
  magic does this: its input sytnax is the same as 
 \family typewriter
 %macro
 \family default
 , but it saves your input directly to a Python file.
  Note that the 
 \family typewriter
 %logstart
 \family default
  command also saves input, but it logs 
 \emph on
 all
 \emph default
  input to disk (though you can temporarily suspend it and reactivate it
  with 
 \family typewriter
 %logoff/%logon
 \family default
 ); 
 \family typewriter
 %save
 \family default
  allows you to select which lines of input you need to save.
 \end_layout
 
 \begin_layout Subsubsection*
 Lightweight 'version control'
 \end_layout
 
 \begin_layout Standard
 When you call 
 \family typewriter
 %edit
 \family default
  with no arguments, IPython opens an empty editor with a temporary file,
  and it returns the contents of your editing session as a string variable.
  Thanks to IPython's output caching mechanism, this is automatically stored:
 \end_layout
 
 \begin_layout LyX-Code
 In [1]: %edit
 \end_layout
 
 \begin_layout LyX-Code
 IPython will make a temporary file named: /tmp/ipython_edit_yR-HCN.py
 \end_layout
 
 \begin_layout LyX-Code
 Editing...
  done.
  Executing edited code...
 \end_layout
 
 \begin_layout LyX-Code
 hello - this is a temporary file
 \end_layout
 
 \begin_layout LyX-Code
 Out[1]: "print 'hello - this is a temporary file'
 \backslash
 n"
 \end_layout
 
 \begin_layout Standard
 Now, if you call 
 \family typewriter
 `%edit -p'
 \family default
 , IPython tries to open an editor with the same data as the last time you
  used 
 \family typewriter
 %edit
 \family default
 .
  So if you haven't used 
 \family typewriter
 %edit
 \family default
  in the meantime, this same contents will reopen; however, it will be done
  in a 
 \emph on
 new file
 \emph default
 .
  This means that if you make changes and you later want to find an old version,
  you can always retrieve it by using its output number, via 
 \family typewriter
 `%edit _NN'
 \family default
 , where 
 \family typewriter
 NN
 \family default
  is the number of the output prompt.
 \end_layout
 
 \begin_layout Standard
 Continuing with the example above, this should illustrate this idea:
 \end_layout
 
 \begin_layout LyX-Code
 In [2]: edit -p
 \end_layout
 
 \begin_layout LyX-Code
 IPython will make a temporary file named: /tmp/ipython_edit_nA09Qk.py
 \end_layout
 
 \begin_layout LyX-Code
 Editing...
  done.
  Executing edited code...
 \end_layout
 
 \begin_layout LyX-Code
 hello - now I made some changes
 \end_layout
 
 \begin_layout LyX-Code
 Out[2]: "print 'hello - now I made some changes'
 \backslash
 n"
 \end_layout
 
 \begin_layout LyX-Code
 In [3]: edit _1
 \end_layout
 
 \begin_layout LyX-Code
 IPython will make a temporary file named: /tmp/ipython_edit_gy6-zD.py
 \end_layout
 
 \begin_layout LyX-Code
 Editing...
  done.
  Executing edited code...
 \end_layout
 
 \begin_layout LyX-Code
 hello - this is a temporary file
 \end_layout
 
 \begin_layout LyX-Code
 IPython version control at work :)
 \end_layout
 
 \begin_layout LyX-Code
 Out[3]: "print 'hello - this is a temporary file'
 \backslash
 nprint 'IPython version control at work :)'
 \backslash
 n"
 \end_layout
 
 \begin_layout Standard
 This section was written after a contribution by Alexander Belchenko on
  the IPython user list.
 \end_layout
 
 \begin_layout LyX-Code
 
 \end_layout
 
 \begin_layout Subsection
 Effective logging
 \end_layout
 
 \begin_layout Standard
 A very useful suggestion sent in by Robert Kern follows:
 \end_layout
 
 \begin_layout Standard
 I recently happened on a nifty way to keep tidy per-project log files.
  I made a profile for my project (which is called "parkfield").
 \end_layout
 
 \begin_layout LyX-Code
 include ipythonrc
 \end_layout
 
 \begin_layout LyX-Code
 # cancel earlier logfile invocation:
 \end_layout
 
 \begin_layout LyX-Code
 logfile ''
 \end_layout
 
 \begin_layout LyX-Code
 execute import time
 \end_layout
 
 \begin_layout LyX-Code
 execute __cmd = '/Users/kern/research/logfiles/parkfield-%s.log rotate'
 \end_layout
 
 \begin_layout LyX-Code
 execute __IP.magic_logstart(__cmd % time.strftime('%Y-%m-%d'))
 \end_layout
 
 \begin_layout Standard
 I also added a shell alias for convenience:
 \end_layout
 
 \begin_layout LyX-Code
 alias parkfield="ipython -pylab -profile parkfield"
 \end_layout
 
 \begin_layout Standard
 Now I have a nice little directory with everything I ever type in, organized
  by project and date.
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Contribute your own: 
 \series default
 If you have your own favorite tip on using IPython efficiently for a certain
  task (especially things which can't be done in the normal Python interpreter),
  don't hesitate to send it!
 \end_layout
 
 \begin_layout Section
 Command-line use
 \end_layout
 
 \begin_layout Standard
 You start IPython with the command:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 $ ipython [options] files
 \end_layout
 
 \begin_layout Standard
 If invoked with no options, it executes all the files listed in sequence
  and drops you into the interpreter while still acknowledging any options
  you may have set in your ipythonrc file.
  This behavior is different from standard Python, which when called as 
 \family typewriter
 python -i
 \family default
  will only execute one file and ignore your configuration setup.
 \end_layout
 
 \begin_layout Standard
 Please note that some of the configuration options are not available at
  the command line, simply because they are not practical here.
  Look into your ipythonrc configuration file for details on those.
  This file typically installed in the 
 \family typewriter
 $HOME/.ipython
 \family default
  directory.
  For Windows users, 
 \family typewriter
 $HOME
 \family default
  resolves to 
 \family typewriter
 C:
 \backslash
 
 \backslash
 Documents and Settings
 \backslash
 
 \backslash
 YourUserName
 \family default
  in most instances.
  In the rest of this text, we will refer to this directory as 
 \family typewriter
 IPYTHONDIR
 \family default
 .
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:threading-opts}
 
 \end_inset
 
 Special Threading Options
 \end_layout
 
 \begin_layout Standard
 The following special options are ONLY valid at the beginning of the command
  line, and not later.
  This is because they control the initial- ization of ipython itself, before
  the normal option-handling mechanism is active.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -gthread,\InsetSpace ~
 -qthread,\InsetSpace ~
 -q4thread,\InsetSpace ~
 -wthread,\InsetSpace ~
 -pylab:
 \family default
 \series default
  Only 
 \emph on
 one
 \emph default
  of these can be given, and it can only be given as the first option passed
  to IPython (it will have no effect in any other position).
  They provide threading support for the GTK, Qt (versions 3 and 4) and WXPython
  toolkits, and for the matplotlib library.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  With any of the first four options, IPython starts running a separate thread
  for the graphical toolkit's operation, so that you can open and control
  graphical elements from within an IPython command line, without blocking.
  All four provide essentially the same functionality, respectively for GTK,
  Qt3, Qt4 and WXWidgets (via their Python interfaces).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Note that with 
 \family typewriter
 -wthread
 \family default
 , you can additionally use the -wxversion option to request a specific version
  of wx to be used.
  This requires that you have the 
 \family typewriter
 wxversion
 \family default
  Python module installed, which is part of recent wxPython distributions.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  If 
 \family typewriter
 -pylab
 \family default
  is given, IPython loads special support for the mat plotlib library (
 \begin_inset LatexCommand \htmlurl{http://matplotlib.sourceforge.net}
 
 \end_inset
 
 ), allowing interactive usage of any of its backends as defined in the user's
  
 \family typewriter
 ~/.matplotlib/matplotlibrc
 \family default
  file.
  It automatically activates GTK, Qt or WX threading for IPyhton if the choice
  of matplotlib backend requires it.
  It also modifies the 
 \family typewriter
 %run
 \family default
  command to correctly execute (without blocking) any matplotlib-based script
  which calls 
 \family typewriter
 show()
 \family default
  at the end.
  
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -tk
 \family default
 \series default
  The 
 \family typewriter
 -g/q/q4/wthread
 \family default
  options, and 
 \family typewriter
 -pylab
 \family default
  (if matplotlib is configured to use GTK, Qt3, Qt4 or WX), will normally
  block Tk graphical interfaces.
  This means that when either GTK, Qt or WX threading is active, any attempt
  to open a Tk GUI will result in a dead window, and possibly cause the Python
  interpreter to crash.
  An extra option, 
 \family typewriter
 -tk
 \family default
 , is available to address this issue.
  It can 
 \emph on
 only
 \emph default
  be given as a 
 \emph on
 second
 \emph default
  option after any of the above (
 \family typewriter
 -gthread
 \family default
 , 
 \family typewriter
 -wthread
 \family default
  or 
 \family typewriter
 -pylab
 \family default
 ).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  If 
 \family typewriter
 -tk
 \family default
  is given, IPython will try to coordinate Tk threading with GTK, Qt or WX.
  This is however potentially unreliable, and you will have to test on your
  platform and Python configuration to determine whether it works for you.
  Debian users have reported success, apparently due to the fact that Debian
  builds all of Tcl, Tk, Tkinter and Python with pthreads support.
  Under other Linux environments (such as Fedora Core 2/3), this option has
  caused random crashes and lockups of the Python interpreter.
  Under other operating systems (Mac OSX and Windows), you'll need to try
  it to find out, since currently no user reports are available.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  There is unfortunately no way for IPython to determine at run time whether
  
 \family typewriter
 -tk
 \family default
  will work reliably or not, so you will need to do some experiments before
  relying on it for regular work.
  
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:cmd-line-opts}
 
 \end_inset
 
 Regular Options
 \end_layout
 
 \begin_layout Standard
 After the above threading options have been given, regular options can follow
  in any order.
  All options can be abbreviated to their shortest non-ambiguous form and
  are case-sensitive.
  One or two dashes can be used.
  Some options have an alternate short form, indicated after a 
 \family typewriter
 |
 \family default
 .
 \end_layout
 
 \begin_layout Standard
 Most options can also be set from your ipythonrc configuration file.
  See the provided example for more details on what the options do.
  Options given at the command line override the values set in the ipythonrc
  file.
 \end_layout
 
 \begin_layout Standard
 All options with a 
 \family typewriter
 [no]
 \family default
  prepended can be specified in negated form (
 \family typewriter
 -nooption
 \family default
  instead of 
 \family typewriter
 -option
 \family default
 ) to turn the feature off.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -help
 \family default
 \series default
 : print a help message and exit.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -pylab:
 \family default
 \series default
  this can 
 \emph on
 only
 \emph default
  be given as the 
 \emph on
 first
 \emph default
  option passed to IPython (it will have no effect in any other position).
  It adds special support for the matplotlib library (
 \begin_inset LatexCommand \htmlurl[http://matplotlib.sourceforge.net]{http://matplotlib.sourceforge.net}
 
 \end_inset
 
 ), allowing interactive usage of any of its backends as defined in the user's
  
 \family typewriter
 .matplotlibrc
 \family default
  file.
  It automatically activates GTK or WX threading for IPyhton if the choice
  of matplotlib backend requires it.
  It also modifies the 
 \family typewriter
 %run
 \family default
  command to correctly execute (without blocking) any matplotlib-based script
  which calls 
 \family typewriter
 show()
 \family default
  at the end.
  See Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:matplotlib-support}
 
 \end_inset
 
  for more details.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -autocall <val>:
 \family default
 \series default
  Make IPython automatically call any callable object even if you didn't
  type explicit parentheses.
  For example, `str 43' becomes `str(43)' automatically.
  The value can be `0' to disable the feature, `1' for 
 \emph on
 smart
 \emph default
  autocall, where it is not applied if there are no more arguments on the
  line, and `2' for 
 \emph on
 full
 \emph default
  autocall, where all callable objects are automatically called (even if
  no arguments are present).
  The default is `1'.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]autoindent:
 \family default
 \series default
  Turn automatic indentation on/off.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]automagic
 \series default
 :
 \family default
  make magic commands automatic (without needing their first character to
  be 
 \family typewriter
 %
 \family default
 ).
  Type 
 \family typewriter
 %magic
 \family default
  at the IPython prompt for more information.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]autoedit_syntax:
 \family default
 \series default
  When a syntax error occurs after editing a file, automatically open the
  file to the trouble causing line for convenient fixing.
  
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]banner
 \series default
 :
 \family default
  Print the initial information banner (default on).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -c\InsetSpace ~
 <command>:
 \family default
 \series default
  execute the given command string, and set sys.argv to 
 \family typewriter
 ['c']
 \family default
 .
  This is similar to the 
 \family typewriter
 -c
 \family default
  option in the normal Python interpreter.
  
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -cache_size|cs\InsetSpace ~
 <n>
 \series default
 :
 \family default
  size of the output cache (maximum number of entries to hold in memory).
  The default is 1000, you can change it permanently in your config file.
  Setting it to 0 completely disables the caching system, and the minimum
  value accepted is 20 (if you provide a value less than 20, it is reset
  to 0 and a warning is issued) This limit is defined because otherwise you'll
  spend more time re-flushing a too small cache than working.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -classic|cl
 \series default
 :
 \family default
  Gives IPython a similar feel to the classic Python prompt.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -colors\InsetSpace ~
 <scheme>:
 \family default
 \series default
  Color scheme for prompts and exception reporting.
  Currently implemented: NoColor, Linux and LightBG.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]color_info:
 \family default
 \series default
  IPython can display information about objects via a set of functions, and
  optionally can use colors for this, syntax highlighting source code and
  various other elements.
  However, because this information is passed through a pager (like 'less')
  and many pagers get confused with color codes, this option is off by default.
  You can test it and turn it on permanently in your ipythonrc file if it
  works for you.
  As a reference, the 'less' pager supplied with Mandrake 8.2 works ok, but
  that in RedHat 7.2 doesn't.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Test it and turn it on permanently if it works with your system.
  The magic function 
 \family typewriter
 %color_info
 \family default
  allows you to toggle this interactively for testing.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]debug
 \family default
 \series default
 : Show information about the loading process.
  Very useful to pin down problems with your configuration files or to get
  details about session restores.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]deep_reload
 \series default
 :
 \family default
  IPython can use the 
 \family typewriter
 deep_reload
 \family default
  module which reloads changes in modules recursively (it replaces the 
 \family typewriter
 reload()
 \family default
  function, so you don't need to change anything to use it).
  
 \family typewriter
 deep_reload()
 \family default
  forces a full reload of modules whose code may have changed, which the
  default 
 \family typewriter
 reload()
 \family default
  function does not.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  When deep_reload is off, IPython will use the normal 
 \family typewriter
 reload()
 \family default
 , but deep_reload will still be available as 
 \family typewriter
 dreload()
 \family default
 .
  This feature is off by default [which means that you have both normal 
 \family typewriter
 reload()
 \family default
  and 
 \family typewriter
 dreload()
 \family default
 ].
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -editor\InsetSpace ~
 <name>
 \family default
 \series default
 : Which editor to use with the 
 \family typewriter
 %edit
 \family default
  command.
  By default, IPython will honor your 
 \family typewriter
 EDITOR
 \family default
  environment variable (if not set, vi is the Unix default and notepad the
  Windows one).
  Since this editor is invoked on the fly by IPython and is meant for editing
  small code snippets, you may want to use a small, lightweight editor here
  (in case your default 
 \family typewriter
 EDITOR
 \family default
  is something like Emacs).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -ipythondir\InsetSpace ~
 <name>
 \series default
 :
 \family default
  name of your IPython configuration directory 
 \family typewriter
 IPYTHONDIR
 \family default
 .
  This can also be specified through the environment variable 
 \family typewriter
 IPYTHONDIR
 \family default
 .
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -log|l
 \family default
 \series default
 : generate a log file of all input.
  The file is named 
 \family typewriter
 ipython_log.py
 \family default
  in your current directory (which prevents logs from multiple IPython sessions
  from trampling each other).
  You can use this to later restore a session by loading your logfile as
  a file to be executed with option 
 \family typewriter
 -logplay
 \family default
  (see below).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -logfile|lf\InsetSpace ~
 <name>
 \series default
 : 
 \family default
 specify the name of your logfile.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -logplay|lp\InsetSpace ~
 <name>
 \series default
 :
 \family default
  you can replay a previous log.
  For restoring a session as close as possible to the state you left it in,
  use this option (don't just run the logfile).
  With 
 \family typewriter
 -logplay
 \family default
 , IPython will try to reconstruct the previous working environment in full,
  not just execute the commands in the logfile.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  When a session is restored, logging is automatically turned on again with
  the name of the logfile it was invoked with (it is read from the log header).
  So once you've turned logging on for a session, you can quit IPython and
  reload it as many times as you want and it will continue to log its history
  and restore from the beginning every time.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Caveats: there are limitations in this option.
  The history variables 
 \family typewriter
 _i*
 \family default
 ,
 \family typewriter
 _*
 \family default
  and 
 \family typewriter
 _dh
 \family default
  don't get restored properly.
  In the future we will try to implement full session saving by writing and
  retrieving a 'snapshot' of the memory state of IPython.
  But our first attempts failed because of inherent limitations of Python's
  Pickle module, so this may have to wait.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]messages
 \series default
 :
 \family default
  Print messages which IPython collects about its startup process (default
  on).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]pdb
 \family default
 \series default
 : Automatically call the pdb debugger after every uncaught exception.
  If you are used to debugging using pdb, this puts you automatically inside
  of it after any call (either in IPython or in code called by it) which
  triggers an exception which goes uncaught.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]pprint
 \series default
 :
 \family default
  ipython can optionally use the pprint (pretty printer) module for displaying
  results.
  pprint tends to give a nicer display of nested data structures.
  If you like it, you can turn it on permanently in your config file (default
  off).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -profile|p <name>
 \series default
 :
 \family default
  assume that your config file is 
 \family typewriter
 ipythonrc-<name>
 \family default
  (looks in current dir first, then in 
 \family typewriter
 IPYTHONDIR
 \family default
 ).
  This is a quick way to keep and load multiple config files for different
  tasks, especially if you use the include option of config files.
  You can keep a basic 
 \family typewriter
 IPYTHONDIR/ipythonrc
 \family default
  file and then have other 'profiles' which include this one and load extra
  things for particular tasks.
  For example:
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \InsetSpace ~
  
 \family default
 1.
 
 \family typewriter
  $HOME/.ipython/ipythonrc
 \family default
  : load basic things you always want.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \InsetSpace ~
  
 \family default
 2.
 
 \family typewriter
  $HOME/.ipython/ipythonrc-math
 \family default
  : load (1) and basic math-related modules.
  
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \InsetSpace ~
  
 \family default
 3.
 
 \family typewriter
  $HOME/.ipython/ipythonrc-numeric
 \family default
  : load (1) and Numeric and plotting modules.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Since it is possible to create an endless loop by having circular file
  inclusions, IPython will stop if it reaches 15 recursive inclusions.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -prompt_in1|pi1\InsetSpace ~
 <string>:
 \family default
 \series default
  Specify the string used for input prompts.
  Note that if you are using numbered prompts, the number is represented
  with a '
 \backslash
 #' in the string.
  Don't forget to quote strings with spaces embedded in them.
  Default: '
 \family typewriter
 In\InsetSpace ~
 [
 \backslash
 #]:
 \family default
 '.
  Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:prompts}
 
 \end_inset
 
  discusses in detail all the available escapes to customize your prompts.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -prompt_in2|pi2\InsetSpace ~
 <string>:
 \family default
 \series default
  Similar to the previous option, but used for the continuation prompts.
  The special sequence '
 \family typewriter
 
 \backslash
 D
 \family default
 ' is similar to '
 \family typewriter
 
 \backslash
 #
 \family default
 ', but with all digits replaced dots (so you can have your continuation
  prompt aligned with your input prompt).
  Default: '
 \family typewriter
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 .
 \backslash
 D.:
 \family default
 ' (note three spaces at the start for alignment with '
 \family typewriter
 In\InsetSpace ~
 [
 \backslash
 #]
 \family default
 ').
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -prompt_out|po\InsetSpace ~
 <string>:
 \family default
 \series default
  String used for output prompts, also uses numbers like 
 \family typewriter
 prompt_in1
 \family default
 .
  Default: '
 \family typewriter
 Out[
 \backslash
 #]:
 \family default
 '
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -quick
 \family default
 \series default
 : start in bare bones mode (no config file loaded).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -rcfile\InsetSpace ~
 <name>
 \series default
 :
 \family default
  name of your IPython resource configuration file.
  Normally IPython loads ipythonrc (from current directory) or
 \family typewriter
  IPYTHONDIR/ipythonrc
 \family default
 .
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  If the loading of your config file fails, IPython starts with a bare bones
  configuration (no modules loaded at all).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -[no]readline
 \family default
 \series default
 : use the readline library, which is needed to support name completion and
  command history, among other things.
  It is enabled by default, but may cause problems for users of X/Emacs in
  Python comint or shell buffers.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Note that X/Emacs 'eterm' buffers (opened with 
 \family typewriter
 M-x\InsetSpace ~
 term
 \family default
 ) support IPython's readline and syntax coloring fine, only 'emacs' (
 \family typewriter
 M-x\InsetSpace ~
 shell
 \family default
  and 
 \family typewriter
 C-c\InsetSpace ~
 !
 \family default
 ) buffers do not.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -screen_length|sl\InsetSpace ~
 <n>
 \series default
 :
 \family default
  number of lines of your screen.
  This is used to control printing of very long strings.
  Strings longer than this number of lines will be sent through a pager instead
  of directly printed.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  The default value for this is 0, which means IPython will auto-detect your
  screen size every time it needs to print certain potentially long strings
  (this doesn't change the behavior of the 'print' keyword, it's only triggered
  internally).
  If for some reason this isn't working well (it needs curses support), specify
  it yourself.
  Otherwise don't change the default.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -separate_in|si\InsetSpace ~
 <string>
 \series default
 :
 \family default
  separator before input prompts.
  Default: '
 \family typewriter
 
 \backslash
 n
 \family default
 '
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -separate_out|so\InsetSpace ~
 <string>
 \family default
 \series default
 : separator before output prompts.
  Default: nothing.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -separate_out2|so2\InsetSpace ~
 <string>
 \series default
 :
 \family default
  separator after output prompts.
  Default: nothing.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  For these three options, use the value 0 to specify no separator.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -nosep
 \series default
 : 
 \family default
 shorthand for 
 \family typewriter
 '-SeparateIn 0 -SeparateOut 0 -SeparateOut2 0'
 \family default
 .
  Simply removes all input/output separators.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -upgrade
 \family default
 \series default
 : allows you to upgrade your 
 \family typewriter
 IPYTHONDIR
 \family default
  configuration when you install a new version of IPython.
  Since new versions may include new command line options or example files,
  this copies updated ipythonrc-type files.
  However, it backs up (with a 
 \family typewriter
 .old
 \family default
  extension) all files which it overwrites so that you can merge back any
  customizations you might have in your personal files.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -Version
 \series default
 :
 \family default
  print version information and exit.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -wxversion\InsetSpace ~
 <string>:
 \family default
 \series default
  Select a specific version of wxPython (used in conjunction with 
 \family typewriter
 -wthread
 \family default
 ).
  Requires the wxversion module, part of recent wxPython distributions
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 -xmode\InsetSpace ~
 <modename>
 \series default
 :
 \family default
  Mode for exception reporting.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Valid modes: Plain, Context and Verbose.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Plain: similar to python's normal traceback printing.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Context: prints 5 lines of context source code around each line in the
  traceback.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  Verbose: similar to Context, but additionally prints the variables currently
  visible where the exception happened (shortening their strings if too long).
  This can potentially be very slow, if you happen to have a huge data structure
  whose string representation is complex to compute.
  Your computer may appear to freeze for a while with cpu usage at 100%.
  If this occurs, you can cancel the traceback with Ctrl-C (maybe hitting
  it more than once).
 \end_layout
 
 \begin_layout Section
 Interactive use
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Warning
 \series default
 : IPython relies on the existence of a global variable called 
 \family typewriter
 __IP
 \family default
  which controls the shell itself.
  If you redefine 
 \family typewriter
 __IP
 \family default
  to anything, bizarre behavior will quickly occur.
 \end_layout
 
 \begin_layout Standard
 Other than the above warning, IPython is meant to work as a drop-in replacement
  for the standard interactive interpreter.
  As such, any code which is valid python should execute normally under IPython
  (cases where this is not true should be reported as bugs).
  It does, however, offer many features which are not available at a standard
  python prompt.
  What follows is a list of these.
 \end_layout
 
 \begin_layout Subsection
 Caution for Windows users
 \end_layout
 
 \begin_layout Standard
 Windows, unfortunately, uses the `
 \family typewriter
 
 \backslash
 
 \family default
 ' character as a path separator.
  This is a terrible choice, because `
 \family typewriter
 
 \backslash
 
 \family default
 ' also represents the escape character in most modern programming languages,
  including Python.
  For this reason, issuing many of the commands discussed below (especially
  magics which affect the filesystem) with `
 \family typewriter
 
 \backslash
 
 \family default
 ' in them will cause strange errors.
 \end_layout
 
 \begin_layout Standard
 A partial solution is to use instead the `
 \family typewriter
 /
 \family default
 ' character as a path separator, which Windows recognizes in 
 \emph on
 most
 \emph default
  situations.
  However, in Windows commands `
 \family typewriter
 /
 \family default
 ' flags options, so you can not use it for the root directory.
  This means that paths beginning at the root must be typed in a contrived
  manner like:
 \newline
 
 \family typewriter
 %copy 
 \backslash
 opt/foo/bar.txt 
 \backslash
 tmp
 \end_layout
 
 \begin_layout Standard
 There is no sensible thing IPython can do to truly work around this flaw
  in Windows
 \begin_inset Foot
 status collapsed
 
 \begin_layout Standard
 If anyone comes up with a 
 \emph on
 clean
 \emph default
  solution which works consistently and does not negatively impact other
  platforms at all, I'll gladly accept a patch.
 \end_layout
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:magic}
 
 \end_inset
 
 Magic command system
 \end_layout
 
 \begin_layout Standard
 IPython will treat any line whose first character is a 
 \family typewriter
 %
 \family default
  as a special call to a 'magic' function.
  These allow you to control the behavior of IPython itself, plus a lot of
  system-type features.
  They are all prefixed with a 
 \family typewriter
 %
 \family default
  character, but parameters are given without parentheses or quotes.
 \end_layout
 
 \begin_layout Standard
 Example: typing 
 \family typewriter
 '%cd mydir'
 \family default
  (without the quotes) changes you working directory to 
 \family typewriter
 'mydir'
 \family default
 , if it exists.
 \end_layout
 
 \begin_layout Standard
 If you have 'automagic' enabled (in your 
 \family typewriter
 ipythonrc
 \family default
  file, via the command line option 
 \family typewriter
 -automagic 
 \family default
 or with the 
 \family typewriter
 %automagic
 \family default
  function), you don't need to type in the 
 \family typewriter
 %
 \family default
  explicitly.
  IPython will scan its internal list of magic functions and call one if
  it exists.
  With automagic on you can then just type '
 \family typewriter
 cd mydir
 \family default
 ' to go to directory '
 \family typewriter
 mydir
 \family default
 '.
  The automagic system has the lowest possible precedence in name searches,
  so defining an identifier with the same name as an existing magic function
  will shadow it for automagic use.
  You can still access the shadowed magic function by explicitly using the
  
 \family typewriter
 %
 \family default
  character at the beginning of the line.
 \end_layout
 
 \begin_layout Standard
 An example (with automagic on) should clarify all this:
 \end_layout
 
 \begin_layout LyX-Code
 In [1]: cd ipython # %cd is called by automagic
 \end_layout
 
 \begin_layout LyX-Code
 /home/fperez/ipython
 \end_layout
 
 \begin_layout LyX-Code
 In [2]: cd=1 # now cd is just a variable
 \end_layout
 
 \begin_layout LyX-Code
 In [3]: cd ..
  # and doesn't work as a function anymore
 \end_layout
 
 \begin_layout LyX-Code
 ------------------------------------------------------------
 \end_layout
 
 \begin_layout LyX-Code
     File "<console>", line 1
 \end_layout
 
 \begin_layout LyX-Code
       cd ..
 \end_layout
 
 \begin_layout LyX-Code
           ^
 \end_layout
 
 \begin_layout LyX-Code
 SyntaxError: invalid syntax
 \end_layout
 
 \begin_layout LyX-Code
 
 \end_layout
 
 \begin_layout LyX-Code
 In [4]: %cd ..
  # but %cd always works
 \end_layout
 
 \begin_layout LyX-Code
 /home/fperez
 \end_layout
 
 \begin_layout LyX-Code
 In [5]: del cd # if you remove the cd variable
 \end_layout
 
 \begin_layout LyX-Code
 In [6]: cd ipython # automagic can work again
 \end_layout
 
 \begin_layout LyX-Code
 /home/fperez/ipython
 \end_layout
 
 \begin_layout Standard
 You can define your own magic functions to extend the system.
  The following example defines a new magic command, 
 \family typewriter
 %impall
 \family default
 :
 \end_layout
 
 \begin_layout LyX-Code
 import IPython.ipapi 
 \end_layout
 
 \begin_layout LyX-Code
 ip = IPython.ipapi.get()
 \end_layout
 
 \begin_layout LyX-Code
 
 \end_layout
 
 \begin_layout LyX-Code
 def doimp(self, arg):
 \end_layout
 
 \begin_layout LyX-Code
     ip = self.api
 \end_layout
 
 \begin_layout LyX-Code
     ip.ex("import %s; reload(%s); from %s import *" % (
 \end_layout
 
 \begin_layout LyX-Code
     arg,arg,arg)
 \end_layout
 
 \begin_layout LyX-Code
     )
 \end_layout
 
 \begin_layout LyX-Code
 ip.expose_magic('impall', doimp)
 \end_layout
 
 \begin_layout Standard
 You can also define your own aliased names for magic functions.
  In your 
 \family typewriter
 ipythonrc
 \family default
  file, placing a line like:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 execute __IP.magic_cl = __IP.magic_clear
 \end_layout
 
 \begin_layout Standard
 will define 
 \family typewriter
 %cl
 \family default
  as a new name for 
 \family typewriter
 %clear
 \family default
 .
 \end_layout
 
 \begin_layout Standard
 Type 
 \family typewriter
 %magic
 \family default
  for more information, including a list of all available magic functions
  at any time and their docstrings.
  You can also type 
 \family typewriter
 %magic_function_name?
 \family default
  (see sec.
  
 \begin_inset LatexCommand \ref{sec:dyn-object-info}
 
 \end_inset
 
  for information on the 
 \family typewriter
 '?'
 \family default
  system) to get information about any particular magic function you are
  interested in.
 \end_layout
 
 \begin_layout Subsubsection
 Magic commands
 \end_layout
 
 \begin_layout Standard
 The rest of this section is automatically generated for each release from
  the docstrings in the IPython code.
  Therefore the formatting is somewhat minimal, but this method has the advantage
  of having information always in sync with the code.
 \end_layout
 
 \begin_layout Standard
 A list of all the magic commands available in IPython's 
 \emph on
 default
 \emph default
  installation follows.
  This is similar to what you'll see by simply typing 
 \family typewriter
 %magic
 \family default
  at the prompt, but that will also give you information about magic commands
  you may have added as part of your personal customizations.
 \end_layout
 
 \begin_layout Standard
 \begin_inset Include \input{magic.tex}
 preview false
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Subsection
 Access to the standard Python help
 \end_layout
 
 \begin_layout Standard
 As of Python 2.1, a help system is available with access to object docstrings
  and the Python manuals.
  Simply type 
 \family typewriter
 'help'
 \family default
  (no quotes) to access it.
  You can also type 
 \family typewriter
 help(object)
 \family default
  to obtain information about a given object, and 
 \family typewriter
 help('keyword')
 \family default
  for information on a keyword.
  As noted in sec.
  
 \begin_inset LatexCommand \ref{sec:help-access}
 
 \end_inset
 
 , you need to properly configure your environment variable 
 \family typewriter
 PYTHONDOCS
 \family default
  for this feature to work correctly.
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:dyn-object-info}
 
 \end_inset
 
 Dynamic object information
 \end_layout
 
 \begin_layout Standard
 Typing 
 \family typewriter
 ?word
 \family default
  or 
 \family typewriter
 word?
 \family default
  prints detailed information about an object.
  If certain strings in the object are too long (docstrings, code, etc.) they
  get snipped in the center for brevity.
  This system gives access variable types and values, full source code for
  any object (if available), function prototypes and other useful information.
 \end_layout
 
 \begin_layout Standard
 Typing 
 \family typewriter
 ??word
 \family default
  or 
 \family typewriter
 word??
 \family default
  gives access to the full information without snipping long strings.
  Long strings are sent to the screen through the 
 \family typewriter
 less
 \family default
  pager if longer than the screen and printed otherwise.
  On systems lacking the 
 \family typewriter
 less
 \family default
  command, IPython uses a very basic internal pager.
 \end_layout
 
 \begin_layout Standard
 The following magic functions are particularly useful for gathering information
  about your working environment.
  You can get more details by typing 
 \family typewriter
 %magic
 \family default
  or querying them individually (use 
 \family typewriter
 %function_name?
 \family default
  with or without the 
 \family typewriter
 %
 \family default
 ), this is just a summary:
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 %pdoc\InsetSpace ~
 <object>
 \family default
 \series default
 : Print (or run through a pager if too long) the docstring for an object.
  If the given object is a class, it will print both the class and the constructo
 r docstrings.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 %pdef\InsetSpace ~
 <object>
 \family default
 \series default
 : Print the definition header for any callable object.
  If the object is a class, print the constructor information.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 %psource\InsetSpace ~
 <object>
 \family default
 \series default
 : Print (or run through a pager if too long) the source code for an object.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 %pfile\InsetSpace ~
 <object>
 \family default
 \series default
 : Show the entire source file where an object was defined via a pager, opening
  it at the line where the object definition begins.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 %who/%whos
 \family default
 \series default
 : These functions give information about identifiers you have defined interactiv
 ely (not things you loaded or defined in your configuration files).
  
 \family typewriter
 %who
 \family default
  just prints a list of identifiers and 
 \family typewriter
 %whos
 \family default
  prints a table with some basic details about each identifier.
 \end_layout
 
 \begin_layout Standard
 Note that the dynamic object information functions (
 \family typewriter
 ?/??, %pdoc, %pfile, %pdef, %psource
 \family default
 ) give you access to documentation even on things which are not really defined
  as separate identifiers.
  Try for example typing 
 \family typewriter
 {}.get?
 \family default
  or after doing 
 \family typewriter
 import os
 \family default
 , type 
 \family typewriter
 os.path.abspath??
 \family default
 .
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:readline}
 
 \end_inset
 
 Readline-based features
 \end_layout
 
 \begin_layout Standard
 These features require the GNU readline library, so they won't work if your
  Python installation lacks readline support.
  We will first describe the default behavior IPython uses, and then how
  to change it to suit your preferences.
 \end_layout
 
 \begin_layout Subsubsection
 Command line completion
 \end_layout
 
 \begin_layout Standard
 At any time, hitting TAB will complete any available python commands or
  variable names, and show you a list of the possible completions if there's
  no unambiguous one.
  It will also complete filenames in the current directory if no python names
  match what you've typed so far.
 \end_layout
 
 \begin_layout Subsubsection
 Search command history
 \end_layout
 
 \begin_layout Standard
 IPython provides two ways for searching through previous input and thus
  reduce the need for repetitive typing:
 \end_layout
 
 \begin_layout Enumerate
 Start typing, and then use 
 \family typewriter
 Ctrl-p
 \family default
  (previous,up) and 
 \family typewriter
 Ctrl-n
 \family default
  (next,down) to search through only the history items that match what you've
  typed so far.
  If you use 
 \family typewriter
 Ctrl-p/Ctrl-n
 \family default
  at a blank prompt, they just behave like normal arrow keys.
 \end_layout
 
 \begin_layout Enumerate
 Hit 
 \family typewriter
 Ctrl-r
 \family default
 : opens a search prompt.
  Begin typing and the system searches your history for lines that contain
  what you've typed so far, completing as much as it can.
 \end_layout
 
 \begin_layout Subsubsection
 Persistent command history across sessions
 \end_layout
 
 \begin_layout Standard
 IPython will save your input history when it leaves and reload it next time
  you restart it.
  By default, the history file is named 
 \family typewriter
 $IPYTHONDIR/history
 \family default
 , but if you've loaded a named profile, '
 \family typewriter
 -PROFILE_NAME
 \family default
 ' is appended to the name.
  This allows you to keep separate histories related to various tasks: commands
  related to numerical work will not be clobbered by a system shell history,
  for example.
 \end_layout
 
 \begin_layout Subsubsection
 Autoindent
 \end_layout
 
 \begin_layout Standard
 IPython can recognize lines ending in ':' and indent the next line, while
  also un-indenting automatically after 'raise' or 'return'.
  
 \end_layout
 
 \begin_layout Standard
 This feature uses the readline library, so it will honor your 
 \family typewriter
 ~/.inputrc
 \family default
  configuration (or whatever file your 
 \family typewriter
 INPUTRC
 \family default
  variable points to).
  Adding the following lines to your 
 \family typewriter
 .inputrc
 \family default
  file can make indenting/unindenting more convenient (
 \family typewriter
 M-i
 \family default
  indents, 
 \family typewriter
 M-u
 \family default
  unindents):
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 $if Python
 \newline
 "
 \backslash
 M-i": "\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 " 
 \newline
 "
 \backslash
 M-u": "
 \backslash
 d
 \backslash
 d
 \backslash
 d
 \backslash
 d" 
 \newline
 $endif
 \end_layout
 
 \begin_layout Standard
 Note that there are 4 spaces between the quote marks after 
 \family typewriter
 "M-i"
 \family default
  above.
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Warning:
 \series default
  this feature is ON by default, but it can cause problems with the pasting
  of multi-line indented code (the pasted code gets re-indented on each line).
  A magic function 
 \family typewriter
 %autoindent
 \family default
  allows you to toggle it on/off at runtime.
  You can also disable it permanently on in your 
 \family typewriter
 ipythonrc
 \family default
  file (set 
 \family typewriter
 autoindent 0
 \family default
 ).
 \end_layout
 
 \begin_layout Subsubsection
 Customizing readline behavior
 \end_layout
 
 \begin_layout Standard
 All these features are based on the GNU readline library, which has an extremely
  customizable interface.
  Normally, readline is configured via a file which defines the behavior
  of the library; the details of the syntax for this can be found in the
  readline documentation available with your system or on the Internet.
  IPython doesn't read this file (if it exists) directly, but it does support
  passing to readline valid options via a simple interface.
  In brief, you can customize readline by setting the following options in
  your 
 \family typewriter
 ipythonrc
 \family default
  configuration file (note that these options can 
 \emph on
 not
 \emph default
  be specified at the command line):
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 readline_parse_and_bind:
 \family default
 \series default
  this option can appear as many times as you want, each time defining a
  string to be executed via a 
 \family typewriter
 readline.parse_and_bind()
 \family default
  command.
  The syntax for valid commands of this kind can be found by reading the
  documentation for the GNU readline library, as these commands are of the
  kind which readline accepts in its configuration file.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 readline_remove_delims:
 \family default
 \series default
  a string of characters to be removed from the default word-delimiters list
  used by readline, so that completions may be performed on strings which
  contain them.
  Do not change the default value unless you know what you're doing.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 readline_omit__names
 \family default
 \series default
 : when tab-completion is enabled, hitting 
 \family typewriter
 <tab>
 \family default
  after a '
 \family typewriter
 .
 \family default
 ' in a name will complete all attributes of an object, including all the
  special methods whose names include double underscores (like 
 \family typewriter
 __getitem__
 \family default
  or 
 \family typewriter
 __class__
 \family default
 ).
  If you'd rather not see these names by default, you can set this option
  to 1.
  Note that even when this option is set, you can still see those names by
  explicitly typing a 
 \family typewriter
 _
 \family default
  after the period and hitting 
 \family typewriter
 <tab>
 \family default
 : '
 \family typewriter
 name._<tab>
 \family default
 ' will always complete attribute names starting with '
 \family typewriter
 _
 \family default
 '.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 \InsetSpace ~
  This option is off by default so that new users see all attributes of any
  objects they are dealing with.
 \end_layout
 
 \begin_layout Standard
 You will find the default values along with a corresponding detailed explanation
  in your 
 \family typewriter
 ipythonrc
 \family default
  file.
 \end_layout
 
 \begin_layout Subsection
 Session logging and restoring
 \end_layout
 
 \begin_layout Standard
 You can log all input from a session either by starting IPython with the
  command line switches 
 \family typewriter
 -log
 \family default
  or 
 \family typewriter
 -logfile 
 \family default
 (see sec.
  
 \begin_inset LatexCommand \ref{sec:cmd-line-opts}
 
 \end_inset
 
 )or by activating the logging at any moment with the magic function 
 \family typewriter
 %logstart
 \family default
 .
  
 \end_layout
 
 \begin_layout Standard
 Log files can later be reloaded with the 
 \family typewriter
 -logplay
 \family default
  option and IPython will attempt to 'replay' the log by executing all the
  lines in it, thus restoring the state of a previous session.
  This feature is not quite perfect, but can still be useful in many cases.
 \end_layout
 
 \begin_layout Standard
 The log files can also be used as a way to have a permanent record of any
  code you wrote while experimenting.
  Log files are regular text files which you can later open in your favorite
  text editor to extract code or to 'clean them up' before using them to
  replay a session.
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 %logstart
 \family default
  function for activating logging in mid-session is used as follows:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 %logstart [log_name [log_mode]]
 \end_layout
 
 \begin_layout Standard
 If no name is given, it defaults to a file named 
 \family typewriter
 'log'
 \family default
  in your IPYTHONDIR directory, in 
 \family typewriter
 'rotate'
 \family default
  mode (see below).
 \end_layout
 
 \begin_layout Standard
 '
 \family typewriter
 %logstart name
 \family default
 ' saves to file 
 \family typewriter
 'name'
 \family default
  in 
 \family typewriter
 'backup'
 \family default
  mode.
  It saves your history up to that point and then continues logging.
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 %logstart
 \family default
  takes a second optional parameter: logging mode.
  This can be one of (note that the modes are given unquoted):
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 over
 \family default
 : overwrite existing 
 \family typewriter
 log_name
 \family default
 .
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 backup
 \family default
 : rename (if exists) to 
 \family typewriter
 log_name~
 \family default
  and start 
 \family typewriter
 log_name
 \family default
 .
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 append
 \family default
 : well, that says it.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 rotate
 \family default
 : create rotating logs 
 \family typewriter
 log_name
 \family default
 .
 \family typewriter
 1~
 \family default
 , 
 \family typewriter
 log_name.2~
 \family default
 , etc.
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 %logoff
 \family default
  and 
 \family typewriter
 %logon
 \family default
  functions allow you to temporarily stop and resume logging to a file which
  had previously been started with 
 \family typewriter
 %logstart
 \family default
 .
  They will fail (with an explanation) if you try to use them before logging
  has been started.
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sub:System-shell-access}
 
 \end_inset
 
 System shell access
 \end_layout
 
 \begin_layout Standard
 Any input line beginning with a 
 \family typewriter
 !
 \family default
  character is passed verbatim (minus the 
 \family typewriter
 !
 \family default
 , of course) to the underlying operating system.
  For example, typing 
 \family typewriter
 !ls
 \family default
  will run 
 \family typewriter
 'ls'
 \family default
  in the current directory.
 \end_layout
 
 \begin_layout Subsubsection
 Manual capture of command output
 \end_layout
 
 \begin_layout Standard
 If the input line begins with 
 \emph on
 two
 \emph default
  exclamation marks, 
 \family typewriter
 !!
 \family default
 , the command is executed but its output is captured and returned as a python
  list, split on newlines.
  Any output sent by the subprocess to standard error is printed separately,
  so that the resulting list only captures standard output.
  The 
 \family typewriter
 !!
 \family default
  syntax is a shorthand for the 
 \family typewriter
 %sx
 \family default
  magic command.
 \end_layout
 
 \begin_layout Standard
 Finally, the 
 \family typewriter
 %sc
 \family default
  magic (short for `shell capture') is similar to 
 \family typewriter
 %sx
 \family default
 , but allowing more fine-grained control of the capture details, and storing
  the result directly into a named variable.
 \end_layout
 
 \begin_layout Standard
 See Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:magic}
 
 \end_inset
 
  for details on the magics 
 \family typewriter
 %sc
 \family default
  and 
 \family typewriter
 %sx
 \family default
 , or use IPython's own help (
 \family typewriter
 sc?
 \family default
  and 
 \family typewriter
 sx?
 \family default
 ) for further details.
 \end_layout
 
 \begin_layout Standard
 IPython also allows you to expand the value of python variables when making
  system calls.
  Any python variable or expression which you prepend with 
 \family typewriter
 $
 \family default
  will get expanded before the system call is made.
  
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [1]: pyvar='Hello world'
 \newline
 In [2]: !echo "A python variable: $pyvar" 
 \newline
 A python
  variable: Hello world
 \end_layout
 
 \begin_layout Standard
 If you want the shell to actually see a literal 
 \family typewriter
 $
 \family default
 , you need to type it twice:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [3]: !echo "A system variable: $$HOME" 
 \newline
 A system variable: /home/fperez
 \end_layout
 
 \begin_layout Standard
 You can pass arbitrary expressions, though you'll need to delimit them with
  
 \family typewriter
 {}
 \family default
  if there is ambiguity as to the extent of the expression:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [5]: x=10
 \newline
 In [6]: y=20
 \newline
 In [13]: !echo $x+y 
 \newline
 10+y 
 \newline
 In [7]: !echo ${x+y} 
 \newline
 30
  
 \end_layout
 
 \begin_layout Standard
 Even object attributes can be expanded:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [12]: !echo $sys.argv 
 \newline
 [/home/fperez/usr/bin/ipython] 
 \end_layout
 
 \begin_layout Subsection
 System command aliases
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 %alias
 \family default
  magic function and the 
 \family typewriter
 alias
 \family default
  option in the 
 \family typewriter
 ipythonrc
 \family default
  configuration file allow you to define magic functions which are in fact
  system shell commands.
  These aliases can have parameters.
  
 \end_layout
 
 \begin_layout Standard
 '
 \family typewriter
 %alias alias_name cmd
 \family default
 ' defines '
 \family typewriter
 alias_name
 \family default
 ' as an alias for '
 \family typewriter
 cmd
 \family default
 ' 
 \end_layout
 
 \begin_layout Standard
 Then, typing '
 \family typewriter
 %alias_name params
 \family default
 ' will execute the system command '
 \family typewriter
 cmd params
 \family default
 ' (from your underlying operating system).
  
 \end_layout
 
 \begin_layout Standard
 You can also define aliases with parameters using 
 \family typewriter
 %s
 \family default
  specifiers (one per parameter).
  The following example defines the 
 \family typewriter
 %parts
 \family default
  function as an alias to the command '
 \family typewriter
 echo first %s second %s
 \family default
 ' where each 
 \family typewriter
 %s
 \family default
  will be replaced by a positional parameter to the call to 
 \family typewriter
 %parts:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [1]: alias parts echo first %s second %s
 \newline
 In [2]: %parts A B
 \newline
 first A second
  B 
 \newline
 In [3]: %parts A 
 \newline
 Incorrect number of arguments: 2 expected.
  
 \newline
 parts is an alias to: 'echo first %s second %s' 
 \end_layout
 
 \begin_layout Standard
 If called with no parameters, 
 \family typewriter
 %alias
 \family default
  prints the table of currently defined aliases.
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 %rehash/rehashx
 \family default
  magics allow you to load your entire 
 \family typewriter
 $PATH
 \family default
  as ipython aliases.
  See their respective docstrings (or sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:magic}
 
 \end_inset
 
  for further details).
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:dreload}
 
 \end_inset
 
 Recursive reload
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 dreload
 \family default
  function does a recursive reload of a module: changes made to the module
  since you imported will actually be available without having to exit.
 \end_layout
 
 \begin_layout Subsection
 Verbose and colored exception traceback printouts
 \end_layout
 
 \begin_layout Standard
 IPython provides the option to see very detailed exception tracebacks, which
  can be especially useful when debugging large programs.
  You can run any Python file with the 
 \family typewriter
 %run
 \family default
  function to benefit from these detailed tracebacks.
  Furthermore, both normal and verbose tracebacks can be colored (if your
  terminal supports it) which makes them much easier to parse visually.
 \end_layout
 
 \begin_layout Standard
 See the magic 
 \family typewriter
 xmode
 \family default
  and 
 \family typewriter
 colors
 \family default
  functions for details (just type 
 \family typewriter
 %magic
 \family default
 ).
 \end_layout
 
 \begin_layout Standard
 These features are basically a terminal version of Ka-Ping Yee's 
 \family typewriter
 cgitb
 \family default
  module, now part of the standard Python library.
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:cache_input}
 
 \end_inset
 
 Input caching system
 \end_layout
 
 \begin_layout Standard
 IPython offers numbered prompts (In/Out) with input and output caching.
  All input is saved and can be retrieved as variables (besides the usual
  arrow key recall).
 \end_layout
 
 \begin_layout Standard
 The following GLOBAL variables always exist (so don't overwrite them!):
  
 \family typewriter
 _i
 \family default
 : stores previous input.
  
 \family typewriter
 _ii
 \family default
 : next previous.
  
 \family typewriter
 _iii
 \family default
 : next-next previous.
  
 \family typewriter
 _ih
 \family default
  : a list of all input 
 \family typewriter
 _ih[n]
 \family default
  is the input from line 
 \family typewriter
 n
 \family default
  and this list is aliased to the global variable 
 \family typewriter
 In
 \family default
 .
  If you overwrite 
 \family typewriter
 In
 \family default
  with a variable of your own, you can remake the assignment to the internal
  list with a simple 
 \family typewriter
 'In=_ih'
 \family default
 .
 \end_layout
 
 \begin_layout Standard
 Additionally, global variables named 
 \family typewriter
 _i<n>
 \family default
  are dynamically created (
 \family typewriter
 <n>
 \family default
  being the prompt counter), such that 
 \newline
 
 \family typewriter
 _i<n> == _ih[<n>] == In[<n>].
 \end_layout
 
 \begin_layout Standard
 For example, what you typed at prompt 14 is available as 
 \family typewriter
 _i14,
 \family default
  
 \family typewriter
 _ih[14]
 \family default
  and 
 \family typewriter
 In[14]
 \family default
 .
 \end_layout
 
 \begin_layout Standard
 This allows you to easily cut and paste multi line interactive prompts by
  printing them out: they print like a clean string, without prompt characters.
  You can also manipulate them like regular variables (they are strings),
  modify or exec them (typing 
 \family typewriter
 'exec _i9'
 \family default
  will re-execute the contents of input prompt 9, '
 \family typewriter
 exec In[9:14]+In[18]
 \family default
 ' will re-execute lines 9 through 13 and line 18).
 \end_layout
 
 \begin_layout Standard
 You can also re-execute multiple lines of input easily by using the magic
  
 \family typewriter
 %macro
 \family default
  function (which automates the process and allows re-execution without having
  to type '
 \family typewriter
 exec
 \family default
 ' every time).
  The macro system also allows you to re-execute previous lines which include
  magic function calls (which require special processing).
  Type 
 \family typewriter
 %macro?
 \family default
  or see sec.
  
 \begin_inset LatexCommand \ref{sec:magic}
 
 \end_inset
 
  for more details on the macro system.
 \end_layout
 
 \begin_layout Standard
 A history function 
 \family typewriter
 %hist
 \family default
  allows you to see any part of your input history by printing a range of
  the 
 \family typewriter
 _i
 \family default
  variables.
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:cache_output}
 
 \end_inset
 
 Output caching system
 \end_layout
 
 \begin_layout Standard
 For output that is returned from actions, a system similar to the input
  cache exists but using 
 \family typewriter
 _
 \family default
  instead of 
 \family typewriter
 _i
 \family default
 .
  Only actions that produce a result (NOT assignments, for example) are cached.
  If you are familiar with Mathematica, IPython's 
 \family typewriter
 _
 \family default
  variables behave exactly like Mathematica's 
 \family typewriter
 %
 \family default
  variables.
 \end_layout
 
 \begin_layout Standard
 The following GLOBAL variables always exist (so don't overwrite them!):
  
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 _
 \family default
 \series default
  (a 
 \emph on
 single
 \emph default
  underscore) : stores previous output, like Python's default interpreter.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 __
 \family default
 \series default
  (two underscores): next previous.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 ___
 \family default
 \series default
  (three underscores): next-next previous.
 \end_layout
 
 \begin_layout Standard
 Additionally, global variables named 
 \family typewriter
 _<n> 
 \family default
 are dynamically created (
 \family typewriter
 <n>
 \family default
  being the prompt counter), such that the result of output 
 \family typewriter
 <n>
 \family default
  is always available as 
 \family typewriter
 _<n>
 \family default
  (don't use the angle brackets, just the number, e.g.
  
 \family typewriter
 _21
 \family default
 ).
 \end_layout
 
 \begin_layout Standard
 These global variables are all stored in a global dictionary (not a list,
  since it only has entries for lines which returned a result) available
  under the names 
 \family typewriter
 _oh
 \family default
  and 
 \family typewriter
 Out
 \family default
  (similar to 
 \family typewriter
 _ih
 \family default
  and 
 \family typewriter
 In
 \family default
 ).
  So the output from line 12 can be obtained as 
 \family typewriter
 _12
 \family default
 , 
 \family typewriter
 Out[12]
 \family default
  or 
 \family typewriter
 _oh[12]
 \family default
 .
  If you accidentally overwrite the 
 \family typewriter
 Out
 \family default
  variable you can recover it by typing 
 \family typewriter
 'Out=_oh
 \family default
 ' at the prompt.
 \end_layout
 
 \begin_layout Standard
 This system obviously can potentially put heavy memory demands on your system,
  since it prevents Python's garbage collector from removing any previously
  computed results.
  You can control how many results are kept in memory with the option (at
  the command line or in your 
 \family typewriter
 ipythonrc
 \family default
  file) 
 \family typewriter
 cache_size
 \family default
 .
  If you set it to 0, the whole system is completely disabled and the prompts
  revert to the classic 
 \family typewriter
 '>>>'
 \family default
  of normal Python.
 \end_layout
 
 \begin_layout Subsection
 Directory history
 \end_layout
 
 \begin_layout Standard
 Your history of visited directories is kept in the global list 
 \family typewriter
 _dh
 \family default
 , and the magic 
 \family typewriter
 %cd
 \family default
  command can be used to go to any entry in that list.
  The 
 \family typewriter
 %dhist
 \family default
  command allows you to view this history.
 \end_layout
 
 \begin_layout Subsection
 Automatic parentheses and quotes
 \end_layout
 
 \begin_layout Standard
 These features were adapted from Nathan Gray's LazyPython.
  They are meant to allow less typing for common situations.
 \end_layout
 
 \begin_layout Subsubsection
 Automatic parentheses
 \end_layout
 
 \begin_layout Standard
 Callable objects (i.e.
  functions, methods, etc) can be invoked like this (notice the commas between
  the arguments):
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 >>> callable_ob arg1, arg2, arg3 
 \end_layout
 
 \begin_layout Standard
 and the input will be translated to this: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 --> callable_ob(arg1, arg2, arg3) 
 \end_layout
 
 \begin_layout Standard
 You can force automatic parentheses by using '/' as the first character
  of a line.
  For example:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 >>> /globals # becomes 'globals()' 
 \end_layout
 
 \begin_layout Standard
 Note that the '/' MUST be the first character on the line! This won't work:
  
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 >>> print /globals # syntax error
 \end_layout
 
 \begin_layout Standard
 In most cases the automatic algorithm should work, so you should rarely
  need to explicitly invoke /.
  One notable exception is if you are trying to call a function with a list
  of tuples as arguments (the parenthesis will confuse IPython): 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [1]: zip (1,2,3),(4,5,6) # won't work 
 \end_layout
 
 \begin_layout Standard
 but this will work: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [2]: /zip (1,2,3),(4,5,6)
 \newline
 ------> zip ((1,2,3),(4,5,6)) 
 \newline
 Out[2]= [(1, 4),
  (2, 5), (3, 6)] 
 \end_layout
 
 \begin_layout Standard
 IPython tells you that it has altered your command line by displaying the
  new command line preceded by 
 \family typewriter
 -->
 \family default
 .
  e.g.: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [18]: callable list
 \newline
 -------> callable (list)
 \end_layout
 
 \begin_layout Subsubsection
 Automatic quoting 
 \end_layout
 
 \begin_layout Standard
 You can force automatic quoting of a function's arguments by using 
 \family typewriter
 `,'
 \family default
  or 
 \family typewriter
 `;'
 \family default
  as the first character of a line.
  For example: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 >>> ,my_function /home/me # becomes my_function("/home/me") 
 \end_layout
 
 \begin_layout Standard
 If you use 
 \family typewriter
 `;'
 \family default
  instead, the whole argument is quoted as a single string (while 
 \family typewriter
 `,'
 \family default
  splits on whitespace):
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 >>> ,my_function a b c # becomes my_function("a","b","c")
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 >>> ;my_function a b c # becomes my_function("a b c")
 \end_layout
 
 \begin_layout Standard
 Note that the `
 \family typewriter
 ,
 \family default
 ' or `
 \family typewriter
 ;
 \family default
 ' MUST be the first character on the line! This won't work: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 >>> x = ,my_function /home/me # syntax error
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:customization}
 
 \end_inset
 
 Customization
 \end_layout
 
 \begin_layout Standard
 As we've already mentioned, IPython reads a configuration file which can
  be specified at the command line (
 \family typewriter
 -rcfile
 \family default
 ) or which by default is assumed to be called 
 \family typewriter
 ipythonrc
 \family default
 .
  Such a file is looked for in the current directory where IPython is started
  and then in your 
 \family typewriter
 IPYTHONDIR
 \family default
 , which allows you to have local configuration files for specific projects.
  In this section we will call these types of configuration files simply
  rcfiles (short for resource configuration file).
 \end_layout
 
 \begin_layout Standard
 The syntax of an rcfile is one of key-value pairs separated by whitespace,
  one per line.
  Lines beginning with a 
 \family typewriter
 #
 \family default
  are ignored as comments, but comments can 
 \series bold
 not
 \series default
  be put on lines with data (the parser is fairly primitive).
  Note that these are not python files, and this is deliberate, because it
  allows us to do some things which would be quite tricky to implement if
  they were normal python files.
 \end_layout
 
 \begin_layout Standard
 First, an rcfile can contain permanent default values for almost all command
  line options (except things like 
 \family typewriter
 -help
 \family default
  or 
 \family typewriter
 -Version
 \family default
 ).
  Sec\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:cmd-line-opts}
 
 \end_inset
 
  contains a description of all command-line options.
  However, values you explicitly specify at the command line override the
  values defined in the rcfile.
 \end_layout
 
 \begin_layout Standard
 Besides command line option values, the rcfile can specify values for certain
  extra special options which are not available at the command line.
  These options are briefly described below.
  
 \end_layout
 
 \begin_layout Standard
 Each of these options may appear as many times as you need it in the file.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 include\InsetSpace ~
 <file1>\InsetSpace ~
 <file2>\InsetSpace ~
 ...
 \family default
 \series default
 : you can name 
 \emph on
 other 
 \emph default
 rcfiles you want to recursively load up to 15 levels (don't use the 
 \family typewriter
 <>
 \family default
  brackets in your names!).
  This feature allows you to define a 'base' rcfile with general options
  and special-purpose files which can be loaded only when needed with particular
  configuration options.
  To make this more convenient, IPython accepts the 
 \family typewriter
 -profile <name>
 \family default
  option (abbreviates to 
 \family typewriter
 -p <name
 \family default
 >)
 \family typewriter
  which
 \family default
  tells it to look for an rcfile named 
 \family typewriter
 ipythonrc-<name>
 \family default
 .
  
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 import_mod\InsetSpace ~
 <mod1>\InsetSpace ~
 <mod2>\InsetSpace ~
 ...
 \family default
 \series default
 : import modules with '
 \family typewriter
 import
 \family default
  
 \family typewriter
 <mod1>,<mod2>,...
 \family default
 ' 
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 import_some\InsetSpace ~
 <mod>\InsetSpace ~
 <f1>\InsetSpace ~
 <f2>\InsetSpace ~
 ...
 \family default
 \series default
 : import functions with '
 \family typewriter
 from <mod> import
 \family default
  
 \family typewriter
 <f1>,<f2>,...
 \family default
 ' 
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 import_all\InsetSpace ~
 <mod1>\InsetSpace ~
 <mod2>\InsetSpace ~
 ...
 \family default
 \series default
 : for each module listed import functions with '
 \family typewriter
 from <mod> import *
 \family default
 ' 
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 execute\InsetSpace ~
 <python\InsetSpace ~
 code>
 \family default
 \series default
 : give any single-line python code to be executed.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 execfile\InsetSpace ~
 <filename>
 \family default
 \series default
 : execute the python file given with an '
 \family typewriter
 execfile(filename)
 \family default
 ' command.
  Username expansion is performed on the given names.
  So if you need any amount of extra fancy customization that won't fit in
  any of the above 'canned' options, you can just put it in a separate python
  file and execute it.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 
 \family typewriter
 \series bold
 alias\InsetSpace ~
 <alias_def>
 \family default
 \series default
 : this is equivalent to calling '
 \family typewriter
 %alias\InsetSpace ~
 <alias_def>
 \family default
 ' at the IPython command line.
  This way, from within IPython you can do common system tasks without having
  to exit it or use the 
 \family typewriter
 !
 \family default
  escape.
  IPython isn't meant to be a shell replacement, but it is often very useful
  to be able to do things with files while testing code.
  This gives you the flexibility to have within IPython any aliases you may
  be used to under your normal system shell.
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:ipytonrc-sample}
 
 \end_inset
 
 Sample 
 \family typewriter
 ipythonrc
 \family default
  file
 \end_layout
 
 \begin_layout Standard
 The default rcfile, called 
 \family typewriter
 ipythonrc
 \family default
  and supplied in your 
 \family typewriter
 IPYTHONDIR 
 \family default
 directory contains lots of comments on all of these options.
  We reproduce it here for reference:
 \end_layout
 
 \begin_layout Standard
 \begin_inset ERT
 status open
 
 \begin_layout Standard
 
 
 \backslash
 codelist{../IPython/UserConfig/ipythonrc}
 \end_layout
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:prompts}
 
 \end_inset
 
 Fine-tuning your prompt
 \end_layout
 
 \begin_layout Standard
 IPython's prompts can be customized using a syntax similar to that of the
  
 \family typewriter
 bash
 \family default
  shell.
  Many of 
 \family typewriter
 bash
 \family default
 's escapes are supported, as well as a few additional ones.
  We list them below:
 \end_layout
 
 \begin_layout Description
 
 \backslash
 # the prompt/history count number.
  This escape is automatically wrapped in the coloring codes for the currently
  active color scheme.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 N the 'naked' prompt/history count number: this is just the number itself,
  without any coloring applied to it.
  This lets you produce numbered prompts with your own colors.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 D the prompt/history count, with the actual digits replaced by dots.
  Used mainly in continuation prompts (prompt_in2)
 \end_layout
 
 \begin_layout Description
 
 \backslash
 w the current working directory
 \end_layout
 
 \begin_layout Description
 
 \backslash
 W the basename of current working directory
 \end_layout
 
 \begin_layout Description
 
 \backslash
 X
 \emph on
 n
 \emph default
  where 
 \begin_inset Formula $n=0\ldots5.$
 \end_inset
 
  The current working directory, with 
 \family typewriter
 $HOME
 \family default
  replaced by 
 \family typewriter
 ~
 \family default
 , and filtered out to contain only 
 \begin_inset Formula $n$
 \end_inset
 
  path elements
 \end_layout
 
 \begin_layout Description
 
 \backslash
 Y
 \emph on
 n
 \emph default
  Similar to 
 \backslash
 X
 \emph on
 n
 \emph default
 , but with the 
 \begin_inset Formula $n+1$
 \end_inset
 
  element included if it is 
 \family typewriter
 ~
 \family default
  (this is similar to the behavior of the %c
 \emph on
 n
 \emph default
  escapes in 
 \family typewriter
 tcsh
 \family default
 )
 \end_layout
 
 \begin_layout Description
 
 \backslash
 u the username of the current user
 \end_layout
 
 \begin_layout Description
 
 \backslash
 $ if the effective UID is 0, a #, otherwise a $
 \end_layout
 
 \begin_layout Description
 
 \backslash
 h the hostname up to the first `.'
 \end_layout
 
 \begin_layout Description
 
 \backslash
 H the hostname
 \end_layout
 
 \begin_layout Description
 
 \backslash
 n a newline
 \end_layout
 
 \begin_layout Description
 
 \backslash
 r a carriage return
 \end_layout
 
 \begin_layout Description
 
 \backslash
 v IPython version string
 \end_layout
 
 \begin_layout Standard
 In addition to these, ANSI color escapes can be insterted into the prompts,
  as 
 \family typewriter
 
 \backslash
 C_
 \emph on
 ColorName
 \family default
 \emph default
 .
  The list of valid color names is: Black, Blue, Brown, Cyan, DarkGray, Green,
  LightBlue, LightCyan, LightGray, LightGreen, LightPurple, LightRed, NoColor,
  Normal, Purple, Red, White, Yellow.
 \end_layout
 
 \begin_layout Standard
 Finally, IPython supports the evaluation of arbitrary expressions in your
  prompt string.
  The prompt strings are evaluated through the syntax of PEP 215, but basically
  you can use 
 \family typewriter
 $x.y
 \family default
  to expand the value of 
 \family typewriter
 x.y
 \family default
 , and for more complicated expressions you can use braces: 
 \family typewriter
 ${foo()+x}
 \family default
  will call function 
 \family typewriter
 foo
 \family default
  and add to it the value of 
 \family typewriter
 x
 \family default
 , before putting the result into your prompt.
  For example, using 
 \newline
 
 \family typewriter
 prompt_in1 '${commands.getoutput("uptime")}
 \backslash
 nIn [
 \backslash
 #]: '
 \newline
 
 \family default
 will print the result of the uptime command on each prompt (assuming the
  
 \family typewriter
 commands
 \family default
  module has been imported in your 
 \family typewriter
 ipythonrc
 \family default
  file).
 \end_layout
 
 \begin_layout Subsubsection
 Prompt examples
 \end_layout
 
 \begin_layout Standard
 The following options in an ipythonrc file will give you IPython's default
  prompts:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 prompt_in1 'In [
 \backslash
 #]:'
 \newline
 prompt_in2 '\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 .
 \backslash
 D.:'
 \newline
 prompt_out 'Out[
 \backslash
 #]:'
 \end_layout
 
 \begin_layout Standard
 which look like this:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [1]: 1+2
 \newline
 Out[1]: 3
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [2]: for i in (1,2,3):
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 ...: \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 print i,
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 ...:
 \newline
 1 2 3
 \end_layout
 
 \begin_layout Standard
 These will give you a very colorful prompt with path information:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 #prompt_in1 '
 \backslash
 C_Red
 \backslash
 u
 \backslash
 C_Blue[
 \backslash
 C_Cyan
 \backslash
 Y1
 \backslash
 C_Blue]
 \backslash
 C_LightGreen
 \backslash
 #>'
 \newline
 prompt_in2 ' ..
 \backslash
 D>'
 \newline
 prompt_out '<
 \backslash
 #>' 
 \end_layout
 
 \begin_layout Standard
 which look like this:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 \color red
 fperez
 \color blue
 [
 \color cyan
 ~/ipython
 \color blue
 ]
 \color green
 1>
 \color none
  1+2
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 
 \color red
 <1>
 \color none
  3
 \newline
 
 \color red
 fperez
 \color blue
 [
 \color cyan
 ~/ipython
 \color blue
 ]
 \color green
 2>
 \color none
  for i in (1,2,3):
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 
 \color green
 ...>
 \color none
  \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 print i,
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 
 \color green
 ...>
 \color none
 
 \newline
 1 2 3
 \end_layout
 
 \begin_layout Standard
 The following shows the usage of dynamic expression evaluation:
 \end_layout
 
 \begin_layout Subsection
 \begin_inset LatexCommand \label{sec:profiles}
 
 \end_inset
 
 IPython profiles
 \end_layout
 
 \begin_layout Standard
 As we already mentioned, IPython supports the 
 \family typewriter
 -profile
 \family default
  command-line option (see sec.
  
 \begin_inset LatexCommand \ref{sec:cmd-line-opts}
 
 \end_inset
 
 ).
  A profile is nothing more than a particular configuration file like your
  basic 
 \family typewriter
 ipythonrc
 \family default
  one, but with particular customizations for a specific purpose.
  When you start IPython with '
 \family typewriter
 ipython -profile <name>
 \family default
 ', it assumes that in your 
 \family typewriter
 IPYTHONDIR
 \family default
  there is a file called 
 \family typewriter
 ipythonrc-<name>
 \family default
 , and loads it instead of the normal 
 \family typewriter
 ipythonrc
 \family default
 .
 \end_layout
 
 \begin_layout Standard
 This system allows you to maintain multiple configurations which load modules,
  set options, define functions, etc.
  suitable for different tasks and activate them in a very simple manner.
  In order to avoid having to repeat all of your basic options (common things
  that don't change such as your color preferences, for example), any profile
  can include another configuration file.
  The most common way to use profiles is then to have each one include your
  basic 
 \family typewriter
 ipythonrc
 \family default
  file as a starting point, and then add further customizations.
 \end_layout
 
 \begin_layout Standard
 In sections 
 \begin_inset LatexCommand \ref{sec:syntax-extensions}
 
 \end_inset
 
  and 
 \begin_inset LatexCommand \ref{sec:Gnuplot}
 
 \end_inset
 
  we discuss some particular profiles which come as part of the standard
  IPython distribution.
  You may also look in your 
 \family typewriter
 IPYTHONDIR
 \family default
  directory, any file whose name begins with 
 \family typewriter
 ipythonrc-
 \family default
  is a profile.
  You can use those as examples for further customizations to suit your own
  needs.
 \end_layout
 
 \begin_layout Section
 \begin_inset OptArg
 status open
 
 \begin_layout Standard
 IPython as default...
 \end_layout
 
 \end_inset
 
 IPython as your default Python environment
 \end_layout
 
 \begin_layout Standard
 Python honors the environment variable 
 \family typewriter
 PYTHONSTARTUP 
 \family default
 and will execute at startup the file referenced by this variable.
  If you put at the end of this file the following two lines of code:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 import IPython
 \newline
 IPython.Shell.IPShell().mainloop(sys_exit=1)
 \end_layout
 
 \begin_layout Standard
 then IPython will be your working environment anytime you start Python.
  The 
 \family typewriter
 sys_exit=1
 \family default
  is needed to have IPython issue a call to 
 \family typewriter
 sys.exit()
 \family default
  when it finishes, otherwise you'll be back at the normal Python '
 \family typewriter
 >>>
 \family default
 ' prompt
 \begin_inset Foot
 status collapsed
 
 \begin_layout Standard
 Based on an idea by Holger Krekel.
 \end_layout
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Standard
 This is probably useful to developers who manage multiple Python versions
  and don't want to have correspondingly multiple IPython versions.
  Note that in this mode, there is no way to pass IPython any command-line
  options, as those are trapped first by Python itself.
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:embed}
 
 \end_inset
 
 Embedding IPython
 \end_layout
 
 \begin_layout Standard
 It is possible to start an IPython instance 
 \emph on
 inside
 \emph default
  your own Python programs.
  This allows you to evaluate dynamically the state of your code, operate
  with your variables, analyze them, etc.
  Note however that any changes you make to values while in the shell do
  
 \emph on
 not
 \emph default
  propagate back to the running code, so it is safe to modify your values
  because you won't break your code in bizarre ways by doing so.
 \end_layout
 
 \begin_layout Standard
 This feature allows you to easily have a fully functional python environment
  for doing object introspection anywhere in your code with a simple function
  call.
  In some cases a simple print statement is enough, but if you need to do
  more detailed analysis of a code fragment this feature can be very valuable.
 \end_layout
 
 \begin_layout Standard
 It can also be useful in scientific computing situations where it is common
  to need to do some automatic, computationally intensive part and then stop
  to look at data, plots, etc
 \begin_inset Foot
 status collapsed
 
 \begin_layout Standard
 This functionality was inspired by IDL's combination of the 
 \family typewriter
 stop
 \family default
  keyword and the 
 \family typewriter
 .continue
 \family default
  executive command, which I have found very useful in the past, and by a
  posting on comp.lang.python by cmkl <cmkleffner-AT-gmx.de> on Dec.
  06/01 concerning similar uses of pyrepl.
 \end_layout
 
 \end_inset
 
 .
  Opening an IPython instance will give you full access to your data and
  functions, and you can resume program execution once you are done with
  the interactive part (perhaps to stop again later, as many times as needed).
 \end_layout
 
 \begin_layout Standard
 The following code snippet is the bare minimum you need to include in your
  Python programs for this to work (detailed examples follow later):
 \end_layout
 
 \begin_layout LyX-Code
 from IPython.Shell import IPShellEmbed
 \end_layout
 
 \begin_layout LyX-Code
 ipshell = IPShellEmbed()
 \end_layout
 
 \begin_layout LyX-Code
 ipshell() # this call anywhere in your program will start IPython
 \end_layout
 
 \begin_layout Standard
 You can run embedded instances even in code which is itself being run at
  the IPython interactive prompt with '
 \family typewriter
 %run\InsetSpace ~
 <filename>
 \family default
 '.
  Since it's easy to get lost as to where you are (in your top-level IPython
  or in your embedded one), it's a good idea in such cases to set the in/out
  prompts to something different for the embedded instances.
  The code examples below illustrate this.
 \end_layout
 
 \begin_layout Standard
 You can also have multiple IPython instances in your program and open them
  separately, for example with different options for data presentation.
  If you close and open the same instance multiple times, its prompt counters
  simply continue from each execution to the next.
 \end_layout
 
 \begin_layout Standard
 Please look at the docstrings in the 
 \family typewriter
 Shell.py
 \family default
  module for more details on the use of this system.
 \end_layout
 
 \begin_layout Standard
 The following sample file illustrating how to use the embedding functionality
  is provided in the examples directory as 
 \family typewriter
 example-embed.py
 \family default
 .
  It should be fairly self-explanatory:
 \end_layout
 
 \begin_layout Standard
 \begin_inset ERT
 status open
 
 \begin_layout Standard
 
 
 \backslash
 codelist{examples/example-embed.py}
 \end_layout
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Standard
 Once you understand how the system functions, you can use the following
  code fragments in your programs which are ready for cut and paste:
 \end_layout
 
 \begin_layout Standard
 \begin_inset ERT
 status open
 
 \begin_layout Standard
 
 
 \backslash
 codelist{examples/example-embed-short.py}
 \end_layout
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:using-pdb}
 
 \end_inset
 
 Using the Python debugger (
 \family typewriter
 pdb
 \family default
 )
 \end_layout
 
 \begin_layout Subsection
 Running entire programs via 
 \family typewriter
 pdb
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 pdb
 \family default
 , the Python debugger, is a powerful interactive debugger which allows you
  to step through code, set breakpoints, watch variables, etc.
  IPython makes it very easy to start any script under the control of 
 \family typewriter
 pdb
 \family default
 , regardless of whether you have wrapped it into a 
 \family typewriter
 `main()'
 \family default
  function or not.
  For this, simply type 
 \family typewriter
 `%run -d myscript'
 \family default
  at an IPython prompt.
  See the 
 \family typewriter
 %run
 \family default
  command's documentation (via 
 \family typewriter
 `%run?'
 \family default
  or in Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:magic}
 
 \end_inset
 
 ) for more details, including how to control where 
 \family typewriter
 pdb
 \family default
  will stop execution first.
 \end_layout
 
 \begin_layout Standard
 For more information on the use of the 
 \family typewriter
 pdb
 \family default
  debugger, read the included 
 \family typewriter
 pdb.doc
 \family default
  file (part of the standard Python distribution).
  On a stock Linux system it is located at 
 \family typewriter
 /usr/lib/python2.3/pdb.doc
 \family default
 , but the easiest way to read it is by using the 
 \family typewriter
 help()
 \family default
  function of the 
 \family typewriter
 pdb
 \family default
  module as follows (in an IPython prompt):
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 In [1]: import pdb
 \newline
 In [2]: pdb.help()
 \end_layout
 
 \begin_layout Standard
 This will load the 
 \family typewriter
 pdb.doc
 \family default
  document in a file viewer for you automatically.
 \end_layout
 
 \begin_layout Subsection
 Automatic invocation of 
 \family typewriter
 pdb
 \family default
  on exceptions
 \end_layout
 
 \begin_layout Standard
 IPython, if started with the 
 \family typewriter
 -pdb
 \family default
  option (or if the option is set in your rc file) can call the Python 
 \family typewriter
 pdb
 \family default
  debugger every time your code triggers an uncaught exception
 \begin_inset Foot
 status collapsed
 
 \begin_layout Standard
 Many thanks to Christopher Hart for the request which prompted adding this
  feature to IPython.
 \end_layout
 
 \end_inset
 
 .
  This feature can also be toggled at any time with the 
 \family typewriter
 %pdb
 \family default
  magic command.
  This can be extremely useful in order to find the origin of subtle bugs,
  because 
 \family typewriter
 pdb
 \family default
  opens up at the point in your code which triggered the exception, and while
  your program is at this point `dead', all the data is still available and
  you can walk up and down the stack frame and understand the origin of the
  problem.
 \end_layout
 
 \begin_layout Standard
 Furthermore, you can use these debugging facilities both with the embedded
  IPython mode and without IPython at all.
  For an embedded shell (see sec.
  
 \begin_inset LatexCommand \ref{sec:embed}
 
 \end_inset
 
 ), simply call the constructor with 
 \family typewriter
 `-pdb'
 \family default
  in the argument string and automatically 
 \family typewriter
 pdb
 \family default
  will be called if an uncaught exception is triggered by your code.
  
 \end_layout
 
 \begin_layout Standard
 For stand-alone use of the feature in your programs which do not use IPython
  at all, put the following lines toward the top of your `main' routine:
 \end_layout
 
 \begin_layout Standard
 \align left
 
 \family typewriter
 import sys,IPython.ultraTB 
 \newline
 sys.excepthook = IPython.ultraTB.FormattedTB(mode=`Verbos
 e', color_scheme=`Linux', call_pdb=1)
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 mode
 \family default
  keyword can be either 
 \family typewriter
 `Verbose'
 \family default
  or 
 \family typewriter
 `Plain'
 \family default
 , giving either very detailed or normal tracebacks respectively.
  The 
 \family typewriter
 color_scheme
 \family default
  keyword can be one of 
 \family typewriter
 `NoColor'
 \family default
 , 
 \family typewriter
 `Linux'
 \family default
  (default) or 
 \family typewriter
 `LightBG'
 \family default
 .
  These are the same options which can be set in IPython with 
 \family typewriter
 -colors
 \family default
  and 
 \family typewriter
 -xmode
 \family default
 .
 \end_layout
 
 \begin_layout Standard
 This will give any of your programs detailed, colored tracebacks with automatic
  invocation of 
 \family typewriter
 pdb
 \family default
 .
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:syntax-extensions}
 
 \end_inset
 
 Extensions for syntax processing
 \end_layout
 
 \begin_layout Standard
 This isn't for the faint of heart, because the potential for breaking things
  is quite high.
  But it can be a very powerful and useful feature.
  In a nutshell, you can redefine the way IPython processes the user input
  line to accept new, special extensions to the syntax without needing to
  change any of IPython's own code.
 \end_layout
 
 \begin_layout Standard
 In the 
 \family typewriter
 IPython/Extensions
 \family default
  directory you will find some examples supplied, which we will briefly describe
  now.
  These can be used `as is' (and both provide very useful functionality),
  or you can use them as a starting point for writing your own extensions.
 \end_layout
 
 \begin_layout Subsection
 Pasting of code starting with 
 \family typewriter
 `>>> 
 \family default
 ' or 
 \family typewriter
 `...
  
 \family default
 '
 \end_layout
 
 \begin_layout Standard
 In the python tutorial it is common to find code examples which have been
  taken from real python sessions.
  The problem with those is that all the lines begin with either 
 \family typewriter
 `>>> 
 \family default
 ' or 
 \family typewriter
 `...
  
 \family default
 ', which makes it impossible to paste them all at once.
  One must instead do a line by line manual copying, carefully removing the
  leading extraneous characters.
 \end_layout
 
 \begin_layout Standard
 This extension identifies those starting characters and removes them from
  the input automatically, so that one can paste multi-line examples directly
  into IPython, saving a lot of time.
  Please look at the file 
 \family typewriter
 InterpreterPasteInput.py
 \family default
  in the 
 \family typewriter
 IPython/Extensions
 \family default
  directory for details on how this is done.
 \end_layout
 
 \begin_layout Standard
 IPython comes with a special profile enabling this feature, called 
 \family typewriter
 tutorial
 \family default
 \emph on
 .
 
 \emph default
  Simply start IPython via 
 \family typewriter
 `ipython\InsetSpace ~
 -p\InsetSpace ~
 tutorial'
 \family default
  and the feature will be available.
  In a normal IPython session you can activate the feature by importing the
  corresponding module with:
 \newline
 
 \family typewriter
 In [1]: import IPython.Extensions.InterpreterPasteInput
 \end_layout
 
 \begin_layout Standard
 The following is a 'screenshot' of how things work when this extension is
  on, copying an example from the standard tutorial:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 IPython profile: tutorial
 \newline
 \InsetSpace ~
 
 \newline
 *** Pasting of code with ">>>" or "..." has been enabled.
 \newline
 \InsetSpace ~
 
 \newline
 In
  [1]: >>> def fib2(n): # return Fibonacci series up to n
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
  ...: ...\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
  """Return a list containing the Fibonacci series up to n."""
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
  ...: ...\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
  result = []
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
  ...: ...\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
  a, b = 0, 1
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
  ...: ...\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
  while b < n:
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
  ...: ...\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
  result.append(b)\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
  # see below
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
  ...: ...\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
  a, b = b, a+b
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
  ...: ...\InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
  return result
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
  ...:
 \newline
 \InsetSpace ~
 
 \newline
 In [2]: fib2(10)
 \newline
 Out[2]: [1, 1, 2, 3, 5, 8]
 \end_layout
 
 \begin_layout Standard
 Note that as currently written, this extension does 
 \emph on
 not 
 \emph default
 recognize IPython's prompts for pasting.
  Those are more complicated, since the user can change them very easily,
  they involve numbers and can vary in length.
  One could however extract all the relevant information from the IPython
  instance and build an appropriate regular expression.
  This is left as an exercise for the reader.
 \end_layout
 
 \begin_layout Subsection
 Input of physical quantities with units
 \end_layout
 
 \begin_layout Standard
 The module 
 \family typewriter
 PhysicalQInput
 \family default
  allows a simplified form of input for physical quantities with units.
  This file is meant to be used in conjunction with the 
 \family typewriter
 PhysicalQInteractive
 \family default
  module (in the same directory) and 
 \family typewriter
 Physics.PhysicalQuantities
 \family default
  from Konrad Hinsen's ScientificPython (
 \begin_inset LatexCommand \htmlurl{http://dirac.cnrs-orleans.fr/ScientificPython/}
 
 \end_inset
 
 ).
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 Physics.PhysicalQuantities
 \family default
  module defines 
 \family typewriter
 PhysicalQuantity
 \family default
  objects, but these must be declared as instances of a class.
  For example, to define 
 \family typewriter
 v
 \family default
  as a velocity of 3\InsetSpace ~
 m/s, normally you would write:
 \family typewriter
 
 \newline
 In [1]: v = PhysicalQuantity(3,'m/s')
 \end_layout
 
 \begin_layout Standard
 Using the 
 \family typewriter
 PhysicalQ_Input
 \family default
  extension this can be input instead as:
 \family typewriter
 
 \newline
 In [1]: v = 3 m/s
 \family default
 
 \newline
 which is much more convenient for interactive use (even though it is blatantly
  invalid Python syntax).
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 physics
 \family default
  profile supplied with IPython (enabled via 
 \family typewriter
 'ipython -p physics'
 \family default
 ) uses these extensions, which you can also activate with:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 from math import * # math MUST be imported BEFORE PhysicalQInteractive
 \newline
 from
  IPython.Extensions.PhysicalQInteractive import *
 \newline
 import IPython.Extensions.PhysicalQ
 Input
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:IPython-as-shell}
 
 \end_inset
 
 IPython as a system shell
 \end_layout
 
 \begin_layout Standard
 IPython ships with a special profile called 
 \family typewriter
 pysh
 \family default
 , which you can activate at the command line as 
 \family typewriter
 `ipython -p pysh'
 \family default
 .
  This loads 
 \family typewriter
 InterpreterExec
 \family default
 , along with some additional facilities and a prompt customized for filesystem
  navigation.
 \end_layout
 
 \begin_layout Standard
 Note that this does 
 \emph on
 not
 \emph default
  make IPython a full-fledged system shell.
  In particular, it has no job control, so if you type Ctrl-Z (under Unix),
  you'll suspend pysh itself, not the process you just started.
  
 \end_layout
 
 \begin_layout Standard
 What the shell profile allows you to do is to use the convenient and powerful
  syntax of Python to do quick scripting at the command line.
  Below we describe some of its features.
 \end_layout
 
 \begin_layout Subsection
 Aliases
 \end_layout
 
 \begin_layout Standard
 All of your 
 \family typewriter
 $PATH
 \family default
  has been loaded as IPython aliases, so you should be able to type any normal
  system command and have it executed.
  See 
 \family typewriter
 %alias?
 \family default
  and 
 \family typewriter
 %unalias?
 \family default
  for details on the alias facilities.
  See also 
 \family typewriter
 %rehash?
 \family default
  and 
 \family typewriter
 %rehashx? 
 \family default
 for details on the mechanism used to load 
 \family typewriter
 $PATH
 \family default
 .
 \end_layout
 
 \begin_layout Subsection
 Special syntax
 \end_layout
 
 \begin_layout Standard
 Any lines which begin with 
 \family typewriter
 `~'
 \family default
 , 
 \family typewriter
 `/'
 \family default
  and 
 \family typewriter
 `.'
 \family default
  will be executed as shell commands instead of as Python code.
  The special escapes below are also recognized.
  
 \family typewriter
 !cmd
 \family default
  is valid in single or multi-line input, all others are only valid in single-lin
 e input:
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 !cmd
 \family default
  pass `cmd' directly to the shell 
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 !!cmd
 \family default
  execute `cmd' and return output as a list (split on `
 \backslash
 n') 
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 $var=cmd
 \family default
  capture output of cmd into var, as a string 
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 $$var=cmd
 \family default
  capture output of cmd into var, as a list (split on `
 \backslash
 n')
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 $
 \family default
 /
 \family typewriter
 $$
 \family default
  syntaxes make Python variables from system output, which you can later
  use for further scripting.
  The converse is also possible: when executing an alias or calling to the
  system via 
 \family typewriter
 !
 \family default
 /
 \family typewriter
 !!
 \family default
 , you can expand any python variable or expression by prepending it with
  
 \family typewriter
 $
 \family default
 .
  Full details of the allowed syntax can be found in Python's PEP 215.
 \end_layout
 
 \begin_layout Standard
 A few brief examples will illustrate these (note that the indentation below
  may be incorrectly displayed):
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 fperez[~/test]|3> !ls *s.py 
 \newline
 scopes.py strings.py
 \end_layout
 
 \begin_layout Standard
 ls is an internal alias, so there's no need to use 
 \family typewriter
 !
 \family default
 : 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 fperez[~/test]|4> ls *s.py 
 \newline
 scopes.py* strings.py
 \end_layout
 
 \begin_layout Standard
 !!ls will return the output into a Python variable: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 fperez[~/test]|5> !!ls *s.py 
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 <5> ['scopes.py', 'strings.py'] 
 \newline
 fperez[~/test]|6> print _5 
 \newline
 ['scopes.py', 'strings.py
 ']
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 $
 \family default
  and 
 \family typewriter
 $$
 \family default
  allow direct capture to named variables: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 fperez[~/test]|7> $astr = ls *s.py 
 \newline
 fperez[~/test]|8> astr 
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 <8> 'scopes.py
 \backslash
 nstrings.py'
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 fperez[~/test]|9> $$alist = ls *s.py 
 \newline
 fperez[~/test]|10> alist 
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 <10> ['scopes.py', 'strings.py']
 \end_layout
 
 \begin_layout Standard
 alist is now a normal python list you can loop over.
  Using 
 \family typewriter
 $
 \family default
  will expand back the python values when alias calls are made:
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 fperez[~/test]|11> for f in alist: 
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 |..> \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 print 'file',f, 
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 |..> \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 wc -l $f 
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 |..> 
 \newline
 file scopes.py 13 scopes.py 
 \newline
 file strings.py 4 strings.py
 \end_layout
 
 \begin_layout Standard
 Note that you may need to protect your variables with braces if you want
  to append strings to their names.
  To copy all files in alist to 
 \family typewriter
 .bak
 \family default
  extensions, you must use: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 fperez[~/test]|12> for f in alist: 
 \newline
 
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 hspace*{0mm}
 \end_layout
 
 \end_inset
 
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 |..> \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 \InsetSpace ~
 cp $f ${f}.bak
 \end_layout
 
 \begin_layout Standard
 If you try using 
 \family typewriter
 $f.bak
 \family default
 , you'll get an AttributeError exception saying that your string object
  doesn't have a 
 \family typewriter
 .bak
 \family default
  attribute.
  This is because the 
 \family typewriter
 $
 \family default
  expansion mechanism allows you to expand full Python expressions: 
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 fperez[~/test]|13> echo "sys.platform is: $sys.platform" 
 \newline
 sys.platform is: linux2
 \end_layout
 
 \begin_layout Standard
 IPython's input history handling is still active, which allows you to rerun
  a single block of multi-line input by simply using exec: 
 \newline
 
 \family typewriter
 fperez[~/test]|14> $$alist = ls *.eps 
 \newline
 fperez[~/test]|15> exec _i11 
 \newline
 file image2.eps
  921 image2.eps 
 \newline
 file image.eps 921 image.eps
 \end_layout
 
 \begin_layout Standard
 While these are new special-case syntaxes, they are designed to allow very
  efficient use of the shell with minimal typing.
  At an interactive shell prompt, conciseness of expression wins over readability.
 \end_layout
 
 \begin_layout Subsection
 Useful functions and modules
 \end_layout
 
 \begin_layout Standard
 The os, sys and shutil modules from the Python standard library are automaticall
 y loaded.
  Some additional functions, useful for shell usage, are listed below.
  You can request more help about them with `
 \family typewriter
 ?
 \family default
 '.
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 shell
 \family default
  - execute a command in the underlying system shell 
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 system
 \family default
  - like 
 \family typewriter
 shell()
 \family default
 , but return the exit status of the command
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 sout
 \family default
  - capture the output of a command as a string
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 lout
 \family default
  - capture the output of a command as a list (split on `
 \backslash
 n')
 \end_layout
 
 \begin_layout Description
 
 \family typewriter
 getoutputerror
 \family default
  - capture (output,error) of a shell commandss
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 sout
 \family default
 /
 \family typewriter
 lout
 \family default
  are the functional equivalents of 
 \family typewriter
 $
 \family default
 /
 \family typewriter
 $$
 \family default
 .
  They are provided to allow you to capture system output in the middle of
  true python code, function definitions, etc (where 
 \family typewriter
 $
 \family default
  and 
 \family typewriter
 $$
 \family default
  are invalid).
 \end_layout
 
 \begin_layout Subsection
 Directory management
 \end_layout
 
 \begin_layout Standard
 Since each command passed by pysh to the underlying system is executed in
  a subshell which exits immediately, you can NOT use !cd to navigate the
  filesystem.
 \end_layout
 
 \begin_layout Standard
 Pysh provides its own builtin 
 \family typewriter
 `%cd
 \family default
 ' magic command to move in the filesystem (the 
 \family typewriter
 %
 \family default
  is not required with automagic on).
  It also maintains a list of visited directories (use 
 \family typewriter
 %dhist
 \family default
  to see it) and allows direct switching to any of them.
  Type 
 \family typewriter
 `cd?
 \family default
 ' for more details.
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 %pushd
 \family default
 , 
 \family typewriter
 %popd
 \family default
  and 
 \family typewriter
 %dirs
 \family default
  are provided for directory stack handling.
 \end_layout
 
 \begin_layout Subsection
 Prompt customization
 \end_layout
 
 \begin_layout Standard
 The supplied 
 \family typewriter
 ipythonrc-pysh
 \family default
  profile comes with an example of a very colored and detailed prompt, mainly
  to serve as an illustration.
  The valid escape sequences, besides color names, are:
 \end_layout
 
 \begin_layout Description
 
 \backslash
-# - Prompt number.
+# - Prompt number, wrapped in the color escapes for the input prompt (determined
+ by the current color scheme).
+\end_layout
+
+\begin_layout Description
+
+\backslash
+N - Just the prompt counter number, 
+\emph on
+without
+\emph default
+ any coloring wrappers.
+ You can thus customize the actual prompt colors manually.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 D - Dots, as many as there are digits in 
 \backslash
 # (so they align).
 \end_layout
 
 \begin_layout Description
 
 \backslash
 w - Current working directory (cwd).
 \end_layout
 
 \begin_layout Description
 
 \backslash
 W - Basename of current working directory.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 X
 \emph on
 N
 \emph default
  - Where 
 \emph on
 N
 \emph default
 =0..5.
  N terms of the cwd, with $HOME written as ~.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 Y
 \emph on
 N
 \emph default
  - Where 
 \emph on
 N
 \emph default
 =0..5.
  Like X
 \emph on
 N
 \emph default
 , but if ~ is term 
 \emph on
 N
 \emph default
 +1 it's also shown.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 u - Username.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 H - Full hostname.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 h - Hostname up to first '.'
 \end_layout
 
 \begin_layout Description
 
 \backslash
 $ - Root symbol ($ or #).
  
 \end_layout
 
 \begin_layout Description
 
 \backslash
 t - Current time, in H:M:S format.
 \end_layout
 
 \begin_layout Description
 
 \backslash
 v - IPython release version.
  
 \end_layout
 
 \begin_layout Description
 
 \backslash
 n - Newline.
  
 \end_layout
 
 \begin_layout Description
 
 \backslash
 r - Carriage return.
  
 \end_layout
 
 \begin_layout Description
 
 \backslash
 
 \backslash
  - An explicitly escaped '
 \backslash
 '.
 \end_layout
 
 \begin_layout Standard
 You can configure your prompt colors using any ANSI color escape.
  Each color escape sets the color for any subsequent text, until another
  escape comes in and changes things.
  The valid color escapes are:
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Black
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Blue
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Brown
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Cyan
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_DarkGray
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Green
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_LightBlue
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_LightCyan
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_LightGray
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_LightGreen
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_LightPurple
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_LightRed
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Purple
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Red
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_White
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Yellow
 \end_layout
 
 \begin_layout Description
 
 \backslash
 C_Normal Stop coloring, defaults to your terminal settings.
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:Threading-support}
 
 \end_inset
 
 Threading support
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 WARNING: 
 \series default
 The threading support is still somewhat experimental, and it has only seen
  reasonable testing under Linux.
  Threaded code is particularly tricky to debug, and it tends to show extremely
  platform-dependent behavior.
  Since I only have access to Linux machines, I will have to rely on user's
  experiences and assistance for this area of IPython to improve under other
  platforms.
 \end_layout
 
 \begin_layout Standard
 IPython, via the 
 \family typewriter
 -gthread
 \family default
  , 
 \family typewriter
 -qthread
 \family default
  and 
 \family typewriter
 -wthread
 \family default
  options (described in Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:threading-opts}
 
 \end_inset
 
 ), can run in multithreaded mode to support pyGTK, Qt and WXPython applications
  respectively.
  These GUI toolkits need to control the python main loop of execution, so
  under a normal Python interpreter, starting a pyGTK, Qt or WXPython application
  will immediately freeze the shell.
  
 \end_layout
 
 \begin_layout Standard
 IPython, with one of these options (you can only use one at a time), separates
  the graphical loop and IPython's code execution run into different threads.
  This allows you to test interactively (with 
 \family typewriter
 %run
 \family default
 , for example) your GUI code without blocking.
 \end_layout
 
 \begin_layout Standard
 A nice mini-tutorial on using IPython along with the Qt Designer application
  is available at the SciPy wiki: 
 \begin_inset LatexCommand \htmlurl{http://www.scipy.org/Cookbook/Matplotlib/Qt_with_IPython_and_Designer}
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Subsection
 Tk issues
 \end_layout
 
 \begin_layout Standard
 As indicated in Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:threading-opts}
 
 \end_inset
 
 , a special 
 \family typewriter
 -tk
 \family default
  option is provided to try and allow Tk graphical applications to coexist
  interactively with WX, Qt or GTK ones.
  Whether this works at all, however, is very platform and configuration
  dependent.
  Please experiment with simple test cases before committing to using this
  combination of Tk and GTK/Qt/WX threading in a production environment.
 \end_layout
 
 \begin_layout Subsection
 Signals and Threads
 \end_layout
 
 \begin_layout Standard
 When any of the thread systems (GTK, Qt or WX) are active, either directly
  or via 
 \family typewriter
 -pylab
 \family default
  with a threaded backend, it is impossible to interrupt long-running Python
  code via 
 \family typewriter
 Ctrl-C
 \family default
 .
  IPython can not pass the KeyboardInterrupt exception (or the underlying
  
 \family typewriter
 SIGINT
 \family default
 ) across threads, so any long-running process started from IPython will
  run to completion, or will have to be killed via an external (OS-based)
  mechanism.
 \end_layout
 
 \begin_layout Standard
 To the best of my knowledge, this limitation is imposed by the Python interprete
 r itself, and it comes from the difficulty of writing portable signal/threaded
  code.
  If any user is an expert on this topic and can suggest a better solution,
  I would love to hear about it.
  In the IPython sources, look at the 
 \family typewriter
 Shell.py
 \family default
  module, and in particular at the 
 \family typewriter
 runcode()
 \family default
  method.
  
 \end_layout
 
 \begin_layout Subsection
 I/O pitfalls
 \end_layout
 
 \begin_layout Standard
 Be mindful that the Python interpreter switches between threads every 
 \begin_inset Formula $N$
 \end_inset
 
  bytecodes, where the default value as of Python\InsetSpace ~
 2.3 is 
 \begin_inset Formula $N=100.$
 \end_inset
 
  This value can be read by using the 
 \family typewriter
 sys.getcheckinterval()
 \family default
  function, and it can be reset via 
 \family typewriter
 sys.setcheckinterval(
 \emph on
 N
 \emph default
 )
 \family default
 .
  This switching of threads can cause subtly confusing effects if one of
  your threads is doing file I/O.
  In text mode, most systems only flush file buffers when they encounter
  a 
 \family typewriter
 `
 \backslash
 n'
 \family default
 .
  An instruction as simple as
 \family typewriter
 
 \newline
 \InsetSpace ~
 \InsetSpace ~
 print >> filehandle, 
 \begin_inset Quotes eld
 \end_inset
 
 hello world
 \begin_inset Quotes erd
 \end_inset
 
 
 \family default
 
 \newline
 actually consists of several bytecodes, so it is possible that the newline
  does not reach your file before the next thread switch.
  Similarly, if you are writing to a file in binary mode, the file won't
  be flushed until the buffer fills, and your other thread may see apparently
  truncated files.
  
 \end_layout
 
 \begin_layout Standard
 For this reason, if you are using IPython's thread support and have (for
  example) a GUI application which will read data generated by files written
  to from the IPython thread, the safest approach is to open all of your
  files in unbuffered mode (the third argument to the 
 \family typewriter
 file/open
 \family default
  function is the buffering value):
 \newline
 
 \family typewriter
 \InsetSpace ~
 \InsetSpace ~
 filehandle = open(filename,mode,0)
 \end_layout
 
 \begin_layout Standard
 This is obviously a brute force way of avoiding race conditions with the
  file buffering.
  If you want to do it cleanly, and you have a resource which is being shared
  by the interactive IPython loop and your GUI thread, you should really
  handle it with thread locking and syncrhonization properties.
  The Python documentation discusses these.
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:interactive-demos}
 
 \end_inset
 
 Interactive demos with IPython
 \end_layout
 
 \begin_layout Standard
 IPython ships with a basic system for running scripts interactively in sections,
  useful when presenting code to audiences.
  A few tags embedded in comments (so that the script remains valid Python
  code) divide a file into separate blocks, and the demo can be run one block
  at a time, with IPython printing (with syntax highlighting) the block before
  executing it, and returning to the interactive prompt after each block.
  The interactive namespace is updated after each block is run with the contents
  of the demo's namespace.
 \end_layout
 
 \begin_layout Standard
 This allows you to show a piece of code, run it and then execute interactively
  commands based on the variables just created.
  Once you want to continue, you simply execute the next block of the demo.
  The following listing shows the markup necessary for dividing a script
  into sections for execution as a demo.
 \end_layout
 
 \begin_layout Standard
 \begin_inset ERT
 status open
 
 \begin_layout Standard
 
 
 \backslash
 codelist{examples/example-demo.py}
 \end_layout
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Standard
 In order to run a file as a demo, you must first make a 
 \family typewriter
 Demo
 \family default
  object out of it.
  If the file is named 
 \family typewriter
 myscript.py
 \family default
 , the following code will make a demo:
 \end_layout
 
 \begin_layout LyX-Code
 from IPython.demo import Demo
 \end_layout
 
 \begin_layout LyX-Code
 mydemo = Demo('myscript.py')
 \end_layout
 
 \begin_layout Standard
 This creates the 
 \family typewriter
 mydemo
 \family default
  object, whose blocks you run one at a time by simply calling the object
  with no arguments.
  If you have autocall active in IPython (the default), all you need to do
  is type
 \end_layout
 
 \begin_layout LyX-Code
 mydemo
 \end_layout
 
 \begin_layout Standard
 and IPython will call it, executing each block.
  Demo objects can be restarted, you can move forward or back skipping blocks,
  re-execute the last block, etc.
  Simply use the Tab key on a demo object to see its methods, and call 
 \family typewriter
 `?'
 \family default
  on them to see their docstrings for more usage details.
  In addition, the 
 \family typewriter
 demo
 \family default
  module itself contains a comprehensive docstring, which you can access
  via
 \end_layout
 
 \begin_layout LyX-Code
 from IPython import demo
 \end_layout
 
 \begin_layout LyX-Code
 demo?
 \end_layout
 
 \begin_layout Standard
 
 \series bold
 Limitations:
 \series default
  It is important to note that these demos are limited to fairly simple uses.
  In particular, you can 
 \emph on
 not
 \emph default
  put division marks in indented code (loops, if statements, function definitions
 , etc.) Supporting something like this would basically require tracking the
  internal execution state of the Python interpreter, so only top-level divisions
  are allowed.
  If you want to be able to open an IPython instance at an arbitrary point
  in a program, you can use IPython's embedding facilities, described in
  detail in Sec\SpecialChar \@.
 \InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:embed}
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:matplotlib-support}
 
 \end_inset
 
 Plotting with 
 \family typewriter
 matplotlib
 \family default
  
 \end_layout
 
 \begin_layout Standard
 The matplotlib library (
 \begin_inset LatexCommand \htmlurl[http://matplotlib.sourceforge.net]{http://matplotlib.sourceforge.net}
 
 \end_inset
 
 ) provides high quality 2D plotting for Python.
  Matplotlib can produce plots on screen using a variety of GUI toolkits,
  including Tk, GTK and WXPython.
  It also provides a number of commands useful for scientific computing,
  all with a syntax compatible with that of the popular Matlab program.
 \end_layout
 
 \begin_layout Standard
 IPython accepts the special option 
 \family typewriter
 -pylab
 \family default
  (Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:cmd-line-opts}
 
 \end_inset
 
 ).
  This configures it to support matplotlib, honoring the settings in the
  
 \family typewriter
 .matplotlibrc
 \family default
  file.
  IPython will detect the user's choice of matplotlib GUI backend, and automatica
 lly select the proper threading model to prevent blocking.
  It also sets matplotlib in interactive mode and modifies 
 \family typewriter
 %run
 \family default
  slightly, so that any matplotlib-based script can be executed using 
 \family typewriter
 %run
 \family default
  and the final 
 \family typewriter
 show()
 \family default
  command does not block the interactive shell.
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 -pylab
 \family default
  option must be given first in order for IPython to configure its threading
  mode.
  However, you can still issue other options afterwards.
  This allows you to have a matplotlib-based environment customized with
  additional modules using the standard IPython profile mechanism (Sec.\InsetSpace ~
 
 \begin_inset LatexCommand \ref{sec:profiles}
 
 \end_inset
 
 ): ``
 \family typewriter
 ipython -pylab -p myprofile
 \family default
 '' will load the profile defined in 
 \family typewriter
 ipythonrc-myprofile
 \family default
  after configuring matplotlib.
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:Gnuplot}
 
 \end_inset
 
 Plotting with 
 \family typewriter
 Gnuplot
 \end_layout
 
 \begin_layout Standard
 Through the magic extension system described in sec.
  
 \begin_inset LatexCommand \ref{sec:magic}
 
 \end_inset
 
 , IPython incorporates a mechanism for conveniently interfacing with the
  Gnuplot system (
 \begin_inset LatexCommand \htmlurl{http://www.gnuplot.info}
 
 \end_inset
 
 ).
  Gnuplot is a very complete 2D and 3D plotting package available for many
  operating systems and commonly included in modern Linux distributions.
  
 \end_layout
 
 \begin_layout Standard
 Besides having Gnuplot installed, this functionality requires the 
 \family typewriter
 Gnuplot.py
 \family default
  module for interfacing python with Gnuplot.
  It can be downloaded from: 
 \begin_inset LatexCommand \htmlurl{http://gnuplot-py.sourceforge.net}
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Subsection
 Proper Gnuplot configuration
 \end_layout
 
 \begin_layout Standard
 As of version 4.0, Gnuplot has excellent mouse and interactive keyboard support.
  However, as of 
 \family typewriter
 Gnuplot.py
 \family default
  version 1.7, a new option was added to communicate between Python and Gnuplot
  via FIFOs (pipes).
  This mechanism, while fast, also breaks the mouse system.
  You must therefore set the variable 
 \family typewriter
 prefer_fifo_data
 \family default
  to 
 \family typewriter
 0
 \family default
  in file 
 \family typewriter
 gp_unix.py
 \family default
  if you wish to keep the interactive mouse and keyboard features working
  properly (
 \family typewriter
 prefer_inline_data
 \family default
  also must be 
 \family typewriter
 0
 \family default
 , but this is the default so unless you've changed it manually you should
  be fine).
 \end_layout
 
 \begin_layout Standard
 'Out of the box', Gnuplot is configured with a rather poor set of size,
  color and linewidth choices which make the graphs fairly hard to read on
  modern high-resolution displays (although they work fine on old 640x480
  ones).
  Below is a section of my 
 \family typewriter
 .Xdefaults
 \family default
  file which I use for having a more convenient Gnuplot setup.
  Remember to load it by running 
 \family typewriter
 `xrdb .Xdefaults`
 \family default
 :
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 !******************************************************************
 \newline
 ! gnuplot
  options
 \newline
 ! modify this for a convenient window size
 \newline
 gnuplot*geometry: 780x580
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 ! on-screen font (not for PostScript)
 \newline
 gnuplot*font: -misc-fixed-bold-r-normal--15
 -120-100-100-c-90-iso8859-1
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 ! color options
 \newline
 gnuplot*background: black
 \newline
 gnuplot*textColor: white
 \newline
 gnuplot*borderCo
 lor: white
 \newline
 gnuplot*axisColor: white
 \newline
 gnuplot*line1Color: red
 \newline
 gnuplot*line2Color:
  green
 \newline
 gnuplot*line3Color: blue
 \newline
 gnuplot*line4Color: magenta
 \newline
 gnuplot*line5Color:
  cyan
 \newline
 gnuplot*line6Color: sienna
 \newline
 gnuplot*line7Color: orange
 \newline
 gnuplot*line8Color:
  coral
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 ! multiplicative factor for point styles
 \newline
 gnuplot*pointsize: 2
 \end_layout
 
 \begin_layout Standard
 
 \family typewriter
 ! line width options (in pixels)
 \newline
 gnuplot*borderWidth: 2
 \newline
 gnuplot*axisWidth:
  2
 \newline
 gnuplot*line1Width: 2
 \newline
 gnuplot*line2Width: 2
 \newline
 gnuplot*line3Width: 2
 \newline
 gnuplot*line4Wi
 dth: 2
 \newline
 gnuplot*line5Width: 2
 \newline
 gnuplot*line6Width: 2
 \newline
 gnuplot*line7Width: 2
 \newline
 gnuplot*lin
 e8Width: 2
 \end_layout
 
 \begin_layout Subsection
 The 
 \family typewriter
 IPython.GnuplotRuntime
 \family default
  module
 \end_layout
 
 \begin_layout Standard
 IPython includes a module called 
 \family typewriter
 Gnuplot2.py
 \family default
  which extends and improves the default 
 \family typewriter
 Gnuplot
 \family default
 .
 \family typewriter
 py
 \family default
  (which it still relies upon).
  For example, the new 
 \family typewriter
 plot
 \family default
  function adds several improvements to the original making it more convenient
  for interactive use, and 
 \family typewriter
 hardcopy
 \family default
  fixes a bug in the original which under some circumstances blocks the creation
  of PostScript output.
 \end_layout
 
 \begin_layout Standard
 For scripting use, 
 \family typewriter
 GnuplotRuntime.py
 \family default
  is provided, which wraps 
 \family typewriter
 Gnuplot2.py
 \family default
  and creates a series of global aliases.
  These make it easy to control Gnuplot plotting jobs through the Python
  language.
 \end_layout
 
 \begin_layout Standard
 Below is some example code which illustrates how to configure Gnuplot inside
  your own programs but have it available for further interactive use through
  an embedded IPython instance.
  Simply run this file at a system prompt.
  This file is provided as 
 \family typewriter
 example-gnuplot.py
 \family default
  in the examples directory:
 \end_layout
 
 \begin_layout Standard
 \begin_inset ERT
 status open
 
 \begin_layout Standard
 
 
 \backslash
 codelist{examples/example-gnuplot.py}
 \end_layout
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Subsection
 The 
 \family typewriter
 numeric
 \family default
  profile: a scientific computing environment
 \end_layout
 
 \begin_layout Standard
 The 
 \family typewriter
 numeric
 \family default
  IPython profile, which you can activate with 
 \family typewriter
 `ipython -p numeric
 \family default
 ' will automatically load the IPython Gnuplot extensions (plus Numeric and
  other useful things for numerical computing), contained in the 
 \family typewriter
 IPython.GnuplotInteractive
 \family default
  module.
  This will create the globals 
 \family typewriter
 Gnuplot 
 \family default
 (an alias to the improved Gnuplot2 module), 
 \family typewriter
 gp
 \family default
  (a Gnuplot active instance), the new magic commands 
 \family typewriter
 %gpc
 \family default
  and 
 \family typewriter
 %gp_set_instance
 \family default
  and several other convenient globals.
  Type 
 \family typewriter
 gphelp()
 \family default
  for further details.
 \end_layout
 
 \begin_layout Standard
 This should turn IPython into a convenient environment for numerical computing,
  with all the functions in the NumPy library and the Gnuplot facilities
  for plotting.
  Further improvements can be obtained by loading the SciPy libraries for
  scientific computing, available at 
 \begin_inset LatexCommand \htmlurl{http://scipy.org}
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Standard
 If you are in the middle of a working session with numerical objects and
  need to plot them but you didn't start the 
 \family typewriter
 numeric
 \family default
  profile, you can load these extensions at any time by typing
 \newline
 
 \family typewriter
 from IPython.GnuplotInteractive import *
 \newline
 
 \family default
 at the IPython prompt.
  This will allow you to keep your objects intact and start using Gnuplot
  to view them.
 \end_layout
 
 \begin_layout Section
 Reporting bugs
 \end_layout
 
 \begin_layout Subsection*
 Automatic crash reports
 \end_layout
 
 \begin_layout Standard
 Ideally, IPython itself shouldn't crash.
  It will catch exceptions produced by you, but bugs in its internals will
  still crash it.
 \end_layout
 
 \begin_layout Standard
 In such a situation, IPython will leave a file named 
 \family typewriter
 IPython_crash_report.txt
 \family default
  in your IPYTHONDIR directory (that way if crashes happen several times
  it won't litter many directories, the post-mortem file is always located
  in the same place and new occurrences just overwrite the previous one).
  If you can mail this file to the developers (see sec.
  
 \begin_inset LatexCommand \ref{sec:credits}
 
 \end_inset
 
  for names and addresses), it will help us 
 \emph on
 a lot
 \emph default
  in understanding the cause of the problem and fixing it sooner.
 \end_layout
 
 \begin_layout Subsection*
 The bug tracker
 \end_layout
 
 \begin_layout Standard
 IPython also has an online bug-tracker, located at 
 \begin_inset LatexCommand \htmlurl{http://projects.scipy.org/ipython/ipython/report/1}
 
 \end_inset
 
 .
  In addition to mailing the developers, it would be a good idea to file
  a bug report here.
  This will ensure that the issue is properly followed to conclusion.
  To report new bugs you will have to register first.
 \end_layout
 
 \begin_layout Standard
 You can also use this bug tracker to file feature requests.
 \end_layout
 
 \begin_layout Section
 Brief history
 \end_layout
 
 \begin_layout Subsection
 Origins
 \end_layout
 
 \begin_layout Standard
 The current IPython system grew out of the following three projects:
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 ipython by Fernando P
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 '{e}
 \end_layout
 
 \end_inset
 
 rez.
  I was working on adding Mathematica-type prompts and a flexible configuration
  system (something better than 
 \family typewriter
 $PYTHONSTARTUP
 \family default
 ) to the standard Python interactive interpreter.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 IPP by Janko Hauser.
  Very well organized, great usability.
  Had an old help system.
  IPP was used as the `container' code into which I added the functionality
  from ipython and LazyPython.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 LazyPython by Nathan Gray.
  Simple but 
 \emph on
 very
 \emph default
  powerful.
  The quick syntax (auto parens, auto quotes) and verbose/colored tracebacks
  were all taken from here.
 \end_layout
 
 \begin_layout Standard
 When I found out (see sec.
  
 \begin_inset LatexCommand \ref{figgins}
 
 \end_inset
 
 ) about IPP and LazyPython I tried to join all three into a unified system.
  I thought this could provide a very nice working environment, both for
  regular programming and scientific computing: shell-like features, IDL/Matlab
  numerics, Mathematica-type prompt history and great object introspection
  and help facilities.
  I think it worked reasonably well, though it was a lot more work than I
  had initially planned.
 \end_layout
 
 \begin_layout Subsection
 Current status
 \end_layout
 
 \begin_layout Standard
 The above listed features work, and quite well for the most part.
  But until a major internal restructuring is done (see below), only bug
  fixing will be done, no other features will be added (unless very minor
  and well localized in the cleaner parts of the code).
 \end_layout
 
 \begin_layout Standard
 IPython consists of some 18000 lines of pure python code, of which roughly
  two thirds is reasonably clean.
  The rest is, messy code which needs a massive restructuring before any
  further major work is done.
  Even the messy code is fairly well documented though, and most of the problems
  in the (non-existent) class design are well pointed to by a PyChecker run.
  So the rewriting work isn't that bad, it will just be time-consuming.
 \end_layout
 
 \begin_layout Subsection
 Future
 \end_layout
 
 \begin_layout Standard
 See the separate 
 \family typewriter
 new_design
 \family default
  document for details.
  Ultimately, I would like to see IPython become part of the standard Python
  distribution as a `big brother with batteries' to the standard Python interacti
 ve interpreter.
  But that will never happen with the current state of the code, so all contribut
 ions are welcome.
 \end_layout
 
 \begin_layout Section
 License
 \end_layout
 
 \begin_layout Standard
 IPython is released under the terms of the BSD license, whose general form
  can be found at: 
 \begin_inset LatexCommand \htmlurl{http://www.opensource.org/licenses/bsd-license.php}
 
 \end_inset
 
 .
  The full text of the IPython license is reproduced below:
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 IPython is released under a BSD-type license.
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 Copyright (c) 2001, 2002, 2003, 2004 Fernando Perez <[e-mail]>.
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 Copyright (c) 2001 Janko Hauser <[e-mail]> and 
 \newline
 Nathaniel Gray <n8gray@ca
 ltech.edu>.
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 All rights reserved.
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 Redistribution and use in source and binary forms, with or without modification,
  are permitted provided that the following conditions are met:
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 a.
  Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 b.
  Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 c.
  Neither the name of the copyright holders nor the names of any contributors
  to this software may be used to endorse or promote products derived from
  this software without specific prior written permission.
 \end_layout
 
 \begin_layout Quote
 
 \family typewriter
 \size small
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  PURPOSE ARE DISCLAIMED.
  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
 \end_layout
 
 \begin_layout Standard
 Individual authors are the holders of the copyright for their code and are
  listed in each file.
 \end_layout
 
 \begin_layout Standard
 Some files (
 \family typewriter
 DPyGetOpt.py
 \family default
 , for example) may be licensed under different conditions.
  Ultimately each file indicates clearly the conditions under which its author/au
 thors have decided to publish the code.
 \end_layout
 
 \begin_layout Standard
 Versions of IPython up to and including 0.6.3 were released under the GNU
  Lesser General Public License (LGPL), available at 
 \begin_inset LatexCommand \htmlurl{http://www.gnu.org/copyleft/lesser.html}
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Section
 \begin_inset LatexCommand \label{sec:credits}
 
 \end_inset
 
 Credits
 \end_layout
 
 \begin_layout Standard
 IPython is mainly developed by Fernando P
 \begin_inset ERT
 status collapsed
 
 \begin_layout Standard
 
 
 \backslash
 '{e}
 \end_layout
 
 \end_inset
 
 rez 
 \family typewriter
 <[e-mail]>
 \family default
 , but the project was born from mixing in Fernando's code with the IPP project
  by Janko Hauser 
 \family typewriter
 <jhauser-AT-zscout.de>
 \family default
  and LazyPython by Nathan Gray 
 \family typewriter
 <n8gray-AT-caltech.edu>
 \family default
 .
  For all IPython-related requests, please contact Fernando.
  
 \end_layout
 
 \begin_layout Standard
 As of early 2006, the following developers have joined the core team:
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Robert\InsetSpace ~
 Kern 
 \family typewriter
 <rkern-AT-enthought.com>
 \family default
 : co-mentored the 2005 Google Summer of Code project to develop python interacti
 ve notebooks (XML documents) and graphical interface.
  This project was awarded to the students Tzanko Matev 
 \family typewriter
 <tsanko-AT-gmail.com>
 \family default
  and Toni Alatalo 
 \family typewriter
 <antont-AT-an.org>
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Brian\InsetSpace ~
 Granger 
 \family typewriter
 <bgranger-AT-scu.edu>
 \family default
 : extending IPython to allow support for interactive parallel computing.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Ville\InsetSpace ~
 Vainio 
 \family typewriter
 <vivainio-AT-gmail.com>
 \family default
 : Ville is the new maintainer for the main trunk of IPython after version
  0.7.1.
 \end_layout
 
 \begin_layout Standard
 User or development help should be requested via the IPython mailing lists:
 \end_layout
 
 \begin_layout Description
 User\InsetSpace ~
 list: 
 \begin_inset LatexCommand \htmlurl{http://scipy.net/mailman/listinfo/ipython-user}
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Description
 Developer's\InsetSpace ~
 list: 
 \begin_inset LatexCommand \htmlurl{http://scipy.net/mailman/listinfo/ipython-dev}
 
 \end_inset
 
 
 \end_layout
 
 \begin_layout Standard
 The IPython project is also very grateful to
 \begin_inset Foot
 status collapsed
 
 \begin_layout Standard
 I've mangled email addresses to reduce spam, since the IPython manuals can
  be accessed online.
 \end_layout
 
 \end_inset
 
 :
 \end_layout
 
 \begin_layout Standard
 Bill Bumgarner 
 \family typewriter
 <bbum-AT-friday.com>
 \family default
 : for providing the DPyGetOpt module which gives very powerful and convenient
  handling of command-line options (light years ahead of what Python 2.1.1's
  getopt module does).
 \end_layout
 
 \begin_layout Standard
 Ka-Ping Yee 
 \family typewriter
 <ping-AT-lfw.org>
 \family default
 : for providing the Itpl module for convenient and powerful string interpolation
  with a much nicer syntax than formatting through the '%' operator.
 \end_layout
 
 \begin_layout Standard
 Arnd Baecker 
 \family typewriter
 <baecker-AT-physik.tu-dresden.de>
 \family default
 : for his many very useful suggestions and comments, and lots of help with
  testing and documentation checking.
  Many of IPython's newer features are a result of discussions with him (bugs
  are still my fault, not his).
 \end_layout
 
 \begin_layout Standard
 Obviously Guido van\InsetSpace ~
 Rossum and the whole Python development team, that goes
  without saying.
 \end_layout
 
 \begin_layout Standard
 IPython's website is generously hosted at 
 \begin_inset LatexCommand \htmlurl{http://ipython.scipy.org}
 
 \end_inset
 
  by Enthought (
 \begin_inset LatexCommand \htmlurl{http://www.enthought.com}
 
 \end_inset
 
 ).
  I am very grateful to them and all of the SciPy team for their contribution.
 \end_layout
 
 \begin_layout Standard
 \begin_inset LatexCommand \label{figgins}
 
 \end_inset
 
 Fernando would also like to thank Stephen Figgins 
 \family typewriter
 <fig-AT-monitor.net>
 \family default
 , an O'Reilly Python editor.
  His Oct/11/2001 article about IPP and LazyPython, was what got this project
  started.
  You can read it at: 
 \begin_inset LatexCommand \htmlurl{http://www.onlamp.com/pub/a/python/2001/10/11/pythonnews.html}
 
 \end_inset
 
 .
 \end_layout
 
 \begin_layout Standard
 And last but not least, all the kind IPython users who have emailed new
  code, bug reports, fixes, comments and ideas.
  A brief list follows, please let me know if I have ommitted your name by
  accident: 
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Jack\InsetSpace ~
 Moffit 
 \family typewriter
 <jack-AT-xiph.org>
 \family default
  Bug fixes, including the infamous color problem.
  This bug alone caused many lost hours and frustration, many thanks to him
  for the fix.
  I've always been a fan of Ogg & friends, now I have one more reason to
  like these folks.
 \newline
 Jack is also contributing with Debian packaging and many
  other things.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Alexander\InsetSpace ~
 Schmolck 
 \family typewriter
 <a.schmolck-AT-gmx.net> 
 \family default
 Emacs work, bug reports, bug fixes, ideas, lots more.
  The ipython.el mode for (X)Emacs is Alex's code, providing full support
  for IPython under (X)Emacs.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Andrea\InsetSpace ~
 Riciputi 
 \family typewriter
 <andrea.riciputi-AT-libero.it>
 \family default
  Mac OSX information, Fink package management.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Gary\InsetSpace ~
 Bishop 
 \family typewriter
 <gb-AT-cs.unc.edu>
 \family default
  Bug reports, and patches to work around the exception handling idiosyncracies
  of WxPython.
  Readline and color support for Windows.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Jeffrey\InsetSpace ~
 Collins 
 \family typewriter
 <Jeff.Collins-AT-vexcel.com>
 \family default
  Bug reports.
  Much improved readline support, including fixes for Python 2.3.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Dryice\InsetSpace ~
 Liu 
 \family typewriter
 <dryice-AT-liu.com.cn>
 \family default
  FreeBSD port.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Mike\InsetSpace ~
 Heeter 
 \family typewriter
 <korora-AT-SDF.LONESTAR.ORG>
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Christopher\InsetSpace ~
 Hart 
 \family typewriter
 <hart-AT-caltech.edu>
 \family default
  PDB integration.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Milan\InsetSpace ~
 Zamazal 
 \family typewriter
 <pdm-AT-zamazal.org>
 \family default
  Emacs info.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Philip\InsetSpace ~
 Hisley 
 \family typewriter
 <compsys-AT-starpower.net>
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Holger\InsetSpace ~
 Krekel 
 \family typewriter
 <pyth-AT-devel.trillke.net>
 \family default
  Tab completion, lots more.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Robin\InsetSpace ~
 Siebler 
 \family typewriter
 <robinsiebler-AT-starband.net>
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Ralf\InsetSpace ~
 Ahlbrink
 \family typewriter
  <ralf_ahlbrink-AT-web.de>
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Thorsten\InsetSpace ~
 Kampe 
 \family typewriter
 <thorsten-AT-thorstenkampe.de>
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Fredrik\InsetSpace ~
 Kant 
 \family typewriter
 <fredrik.kant-AT-front.com>
 \family default
  Windows setup.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Syver\InsetSpace ~
 Enstad 
 \family typewriter
 <syver-en-AT-online.no>
 \family default
  Windows setup.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Richard 
 \family typewriter
 <rxe-AT-renre-europe.com>
 \family default
  Global embedding.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Hayden\InsetSpace ~
 Callow 
 \family typewriter
 <h.callow-AT-elec.canterbury.ac.nz>
 \family default
  Gnuplot.py 1.6 compatibility.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Leonardo\InsetSpace ~
 Santagada 
 \family typewriter
 <retype-AT-terra.com.br>
 \family default
  Fixes for Windows installation.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Christopher\InsetSpace ~
 Armstrong 
 \family typewriter
 <radix-AT-twistedmatrix.com>
 \family default
  Bugfixes.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Francois\InsetSpace ~
 Pinard 
 \family typewriter
 <pinard-AT-iro.umontreal.ca>
 \family default
  Code and documentation fixes.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Cory\InsetSpace ~
 Dodt 
 \family typewriter
 <cdodt-AT-fcoe.k12.ca.us>
 \family default
  Bug reports and Windows ideas.
  Patches for Windows installer.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Olivier\InsetSpace ~
 Aubert 
 \family typewriter
 <oaubert-AT-bat710.univ-lyon1.fr>
 \family default
  New magics.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 King\InsetSpace ~
 C.\InsetSpace ~
 Shu 
 \family typewriter
 <kingshu-AT-myrealbox.com>
 \family default
  Autoindent patch.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Chris\InsetSpace ~
 Drexler 
 \family typewriter
 <chris-AT-ac-drexler.de>
 \family default
  Readline packages for Win32/CygWin.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Gustavo\InsetSpace ~
 Cordova\InsetSpace ~
 Avila 
 \family typewriter
 <gcordova-AT-sismex.com>
 \family default
  EvalDict code for nice, lightweight string interpolation.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Kasper\InsetSpace ~
 Souren 
 \family typewriter
 <Kasper.Souren-AT-ircam.fr>
 \family default
  Bug reports, ideas.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Gever\InsetSpace ~
 Tulley 
 \family typewriter
 <gever-AT-helium.com>
 \family default
  Code contributions.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Ralf\InsetSpace ~
 Schmitt 
 \family typewriter
 <ralf-AT-brainbot.com>
 \family default
  Bug reports & fixes.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Oliver\InsetSpace ~
 Sander 
 \family typewriter
 <osander-AT-gmx.de>
 \family default
  Bug reports.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Rod\InsetSpace ~
 Holland 
 \family typewriter
 <rhh-AT-structurelabs.com>
 \family default
  Bug reports and fixes to logging module.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Daniel\InsetSpace ~
 'Dang'\InsetSpace ~
 Griffith 
 \family typewriter
 <pythondev-dang-AT-lazytwinacres.net>
 \family default
  Fixes, enhancement suggestions for system shell use.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Viktor\InsetSpace ~
 Ransmayr 
 \family typewriter
 <viktor.ransmayr-AT-t-online.de>
 \family default
  Tests and reports on Windows installation issues.
  Contributed a true Windows binary installer.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Mike\InsetSpace ~
 Salib 
 \family typewriter
 <msalib-AT-mit.edu>
 \family default
  Help fixing a subtle bug related to traceback printing.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 W.J.\InsetSpace ~
 van\InsetSpace ~
 der\InsetSpace ~
 Laan 
 \family typewriter
 <gnufnork-AT-hetdigitalegat.nl>
 \family default
  Bash-like prompt specials.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Antoon\InsetSpace ~
 Pardon 
 \family typewriter
 <Antoon.Pardon-AT-rece.vub.ac.be>
 \family default
  Critical fix for the multithreaded IPython.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 John\InsetSpace ~
 Hunter 
 \family typewriter
 <jdhunter-AT-nitace.bsd.uchicago.edu>
 \family default
  Matplotlib author, helped with all the development of support for matplotlib
  in IPyhton, including making necessary changes to matplotlib itself.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Matthew\InsetSpace ~
 Arnison 
 \family typewriter
 <maffew-AT-cat.org.au>
 \family default
  Bug reports, `
 \family typewriter
 %run -d
 \family default
 ' idea.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Prabhu\InsetSpace ~
 Ramachandran 
 \family typewriter
 <prabhu_r-AT-users.sourceforge.net>
 \family default
  Help with (X)Emacs support, threading patches, ideas...
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Norbert\InsetSpace ~
 Tretkowski 
 \family typewriter
 <tretkowski-AT-inittab.de>
 \family default
  help with Debian packaging and distribution.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 George\InsetSpace ~
 Sakkis <
 \family typewriter
 gsakkis-AT-eden.rutgers.edu>
 \family default
  New matcher for tab-completing named arguments of user-defined functions.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 J�rgen\InsetSpace ~
 Stenarson 
 \family typewriter
 <jorgen.stenarson-AT-bostream.nu>
 \family default
  Wildcard support implementation for searching namespaces.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Vivian\InsetSpace ~
 De\InsetSpace ~
 Smedt 
 \family typewriter
 <vivian-AT-vdesmedt.com>
 \family default
  Debugger enhancements, so that when pdb is activated from within IPython,
  coloring, tab completion and other features continue to work seamlessly.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Scott\InsetSpace ~
 Tsai 
 \family typewriter
 <scottt958-AT-yahoo.com.tw>
 \family default
  Support for automatic editor invocation on syntax errors (see 
 \begin_inset LatexCommand \htmlurl{http://www.scipy.net/roundup/ipython/issue36}
 
 \end_inset
 
 ).
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Alexander\InsetSpace ~
 Belchenko 
 \family typewriter
 <bialix-AT-ukr.net>
 \family default
  Improvements for win32 paging system.
 \end_layout
 
 \begin_layout List
 \labelwidthstring 00.00.0000
 Will\InsetSpace ~
 Maier 
 \family typewriter
 <willmaier-AT-ml1.net>
 \family default
  Official OpenBSD port.
 \end_layout
 
 \end_body
 \end_document