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# -*- coding: utf-8 -*-
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#*****************************************************************************
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# Copyright (C) 2001-2004 Fernando Perez. <fperez@colorado.edu>
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#*****************************************************************************
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# $Id: usage.py 578 2005-05-13 21:16:51Z fperez $
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from IPython import Release
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__author__ = '%s <%s>' % Release.authors['Fernando']
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__license__ = Release.license
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__version__ = Release.version
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__doc__ = """
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IPython -- An enhanced Interactive Python
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=========================================
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A Python shell with automatic history (input and output), dynamic object
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introspection, easier configuration, command completion, access to the system
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shell and more.
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IPython can also be embedded in running programs. See EMBEDDING below.
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USAGE
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ipython [options] files
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If invoked with no options, it executes all the files listed in
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sequence and drops you into the interpreter while still acknowledging
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any options you may have set in your ipythonrc file. This behavior is
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different from standard Python, which when called as python -i will
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only execute one file and will ignore your configuration setup.
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Please note that some of the configuration options are not available at
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the command line, simply because they are not practical here. Look into
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your ipythonrc configuration file for details on those. This file
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typically installed in the $HOME/.ipython directory.
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For Windows users, $HOME resolves to C:\\Documents and
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Settings\\YourUserName in most instances, and _ipython is used instead
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of .ipython, since some Win32 programs have problems with dotted names
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in directories.
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In the rest of this text, we will refer to this directory as
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IPYTHONDIR.
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SPECIAL THREADING OPTIONS
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The following special options are ONLY valid at the beginning of the
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command line, and not later. This is because they control the initial-
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ization of ipython itself, before the normal option-handling mechanism
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is active.
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-gthread, -qthread, -wthread, -pylab
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Only ONE of these can be given, and it can only be given as the
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first option passed to IPython (it will have no effect in any
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other position). They provide threading support for the GTK, QT
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and WXWidgets toolkits, and for the matplotlib library.
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With any of the first three options, IPython starts running a
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separate thread for the graphical toolkit's operation, so that
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you can open and control graphical elements from within an
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IPython command line, without blocking. All three provide
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essentially the same functionality, respectively for GTK, QT and
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WXWidgets (via their Python interfaces).
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If -pylab is given, IPython loads special support for the mat-
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plotlib library (http://matplotlib.sourceforge.net), allowing
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interactive usage of any of its backends as defined in the
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user's .matplotlibrc file. It automatically activates GTK, QT
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or WX threading for IPyhton if the choice of matplotlib backend
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requires it. It also modifies the %run command to correctly
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execute (without blocking) any matplotlib-based script which
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calls show() at the end.
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-tk The -g/q/wthread options, and -pylab (if matplotlib is
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configured to use GTK, QT or WX), will normally block Tk
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graphical interfaces. This means that when GTK, QT or WX
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threading is active, any attempt to open a Tk GUI will result in
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a dead window, and possibly cause the Python interpreter to
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crash. An extra option, -tk, is available to address this
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issue. It can ONLY be given as a SECOND option after any of the
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above (-gthread, -qthread, -wthread or -pylab).
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If -tk is given, IPython will try to coordinate Tk threading
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with GTK, QT or WX. This is however potentially unreliable, and
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you will have to test on your platform and Python configuration
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to determine whether it works for you. Debian users have
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reported success, apparently due to the fact that Debian builds
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all of Tcl, Tk, Tkinter and Python with pthreads support. Under
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other Linux environments (such as Fedora Core 2/3), this option
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has caused random crashes and lockups of the Python interpreter.
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Under other operating systems (Mac OSX and Windows), you'll need
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to try it to find out, since currently no user reports are
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available.
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There is unfortunately no way for IPython to determine at run-
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time whether -tk will work reliably or not, so you will need to
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do some experiments before relying on it for regular work.
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A WARNING ABOUT SIGNALS AND THREADS
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When any of the thread systems (GTK, QT or WX) are active, either
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directly or via -pylab with a threaded backend, it is impossible to
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interrupt long-running Python code via Ctrl-C. IPython can not pass
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the KeyboardInterrupt exception (or the underlying SIGINT) across
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threads, so any long-running process started from IPython will run to
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completion, or will have to be killed via an external (OS-based)
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mechanism.
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To the best of my knowledge, this limitation is imposed by the Python
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interpreter itself, and it comes from the difficulty of writing
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portable signal/threaded code. If any user is an expert on this topic
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and can suggest a better solution, I would love to hear about it. In
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the IPython sources, look at the Shell.py module, and in particular at
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the runcode() method.
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REGULAR OPTIONS
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After the above threading options have been given, regular options can
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follow in any order. All options can be abbreviated to their shortest
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non-ambiguous form and are case-sensitive. One or two dashes can be
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used. Some options have an alternate short form, indicated after a |.
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Most options can also be set from your ipythonrc configuration file.
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See the provided examples for assistance. Options given on the comman-
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dline override the values set in the ipythonrc file.
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All options with a no| prepended can be specified in ’no’ form (-noop-
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tion instead of -option) to turn the feature off.
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-h, --help
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Show summary of options.
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-pylab This can only be given as the first option passed to IPython (it
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will have no effect in any other position). It adds special sup-
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port for the matplotlib library (http://matplotlib.source-
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forge.net), allowing interactive usage of any of its backends as
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defined in the user’s .matplotlibrc file. It automatically
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activates GTK or WX threading for IPyhton if the choice of mat-
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plotlib backend requires it. It also modifies the @run command
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to correctly execute (without blocking) any matplotlib-based
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script which calls show() at the end.
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-no|autocall
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Make IPython automatically call any callable object even if you
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didn’t type explicit parentheses. For example, ’str 43’ becomes
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’str(43)’ automatically.
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-no|autoindent
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Turn automatic indentation on/off.
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-no|automagic
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Make magic commands automatic (without needing their first char-
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acter to be @). Type @magic at the IPython prompt for more
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information.
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-no|autoparens
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Make IPython automatically call any callable object even if you
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didn’t type explicit parentheses. For example, ’str 43’ becomes
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’str(43)’ automatically.
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-no|banner
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Print the intial information banner (default on).
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-c <command>
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Execute the given command string, and set sys.argv to [’c’].
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This is similar to the -c option in the normal Python inter-
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preter.
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-cache_size|cs <n>
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Size of the output cache (maximum number of entries to hold in
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memory). The default is 1000, you can change it permanently in
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your config file. Setting it to 0 completely disables the
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caching system, and the minimum value accepted is 20 (if you
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provide a value less than 20, it is reset to 0 and a warning is
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issued). This limit is defined because otherwise you’ll spend
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more time re-flushing a too small cache than working.
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-classic|cl
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Gives IPython a similar feel to the classic Python prompt.
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-colors <scheme>
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Color scheme for prompts and exception reporting. Currently
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implemented: NoColor, Linux, and LightBG.
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-no|color_info
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IPython can display information about objects via a set of func-
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tions, and optionally can use colors for this, syntax highlight-
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ing source code and various other elements. However, because
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this information is passed through a pager (like ’less’) and
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many pagers get confused with color codes, this option is off by
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default. You can test it and turn it on permanently in your
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ipythonrc file if it works for you. As a reference, the ’less’
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pager supplied with Mandrake 8.2 works ok, but that in RedHat
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7.2 doesn’t.
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Test it and turn it on permanently if it works with your system.
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The magic function @color_info allows you to toggle this inter-
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actively for testing.
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-no|confirm_exit
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Set to confirm when you try to exit IPython with an EOF (Con-
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trol-D in Unix, Control-Z/Enter in Windows). Note that using the
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magic functions @Exit or @Quit you can force a direct exit,
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bypassing any confirmation.
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-no|debug
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Show information about the loading process. Very useful to pin
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down problems with your configuration files or to get details
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about session restores.
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-no|deep_reload
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IPython can use the deep_reload module which reloads changes in
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modules recursively (it replaces the reload() function, so you
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don’t need to change anything to use it). deep_reload() forces a
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full reload of modules whose code may have changed, which the
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default reload() function does not.
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When deep_reload is off, IPython will use the normal reload(),
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but deep_reload will still be available as dreload(). This fea-
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ture is off by default [which means that you have both normal
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reload() and dreload()].
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-editor <name>
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Which editor to use with the @edit command. By default, IPython
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will honor your EDITOR environment variable (if not set, vi is
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the Unix default and notepad the Windows one). Since this editor
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is invoked on the fly by IPython and is meant for editing small
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code snippets, you may want to use a small, lightweight editor
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here (in case your default EDITOR is something like Emacs).
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-ipythondir <name>
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The name of your IPython configuration directory IPYTHONDIR.
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This can also be specified through the environment variable
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IPYTHONDIR.
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-log|l Generate a log file of all input. The file is named ipython.log
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in your current directory (which prevents logs from multiple
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IPython sessions from trampling each other). You can use this to
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later restore a session by loading your logfile as a file to be
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executed with option -logplay (see below).
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-logfile|lf
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Specifu the name of your logfile.
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-logplay|lp
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Replay a previous log. For restoring a session as close as pos-
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sible to the state you left it in, use this option (don’t just
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run the logfile). With -logplay, IPython will try to reconstruct
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the previous working environment in full, not just execute the
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commands in the logfile.
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When a session is restored, logging is automatically turned on
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again with the name of the logfile it was invoked with (it is
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read from the log header). So once you’ve turned logging on for
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a session, you can quit IPython and reload it as many times as
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you want and it will continue to log its history and restore
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from the beginning every time.
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Caveats: there are limitations in this option. The history vari-
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ables _i*,_* and _dh don’t get restored properly. In the future
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we will try to implement full session saving by writing and
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retrieving a failed because of inherent limitations of Python’s
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Pickle module, so this may have to wait.
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-no|messages
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Print messages which IPython collects about its startup process
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(default on).
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-no|pdb
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Automatically call the pdb debugger after every uncaught excep-
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tion. If you are used to debugging using pdb, this puts you
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automatically inside of it after any call (either in IPython or
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in code called by it) which triggers an exception which goes
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uncaught.
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-no|pprint
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IPython can optionally use the pprint (pretty printer) module
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for displaying results. pprint tends to give a nicer display of
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nested data structures. If you like it, you can turn it on per-
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manently in your config file (default off).
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-profile|p <name>
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Assume that your config file is ipythonrc-<name> (looks in cur-
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rent dir first, then in IPYTHONDIR). This is a quick way to keep
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and load multiple config files for different tasks, especially
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if you use the include option of config files. You can keep a
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basic IPYTHONDIR/ipythonrc file and then have other ’profiles’
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which include this one and load extra things for particular
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tasks. For example:
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1) $HOME/.ipython/ipythonrc : load basic things you always want.
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2) $HOME/.ipython/ipythonrc-math : load (1) and basic math-
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related modules.
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3) $HOME/.ipython/ipythonrc-numeric : load (1) and Numeric and
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plotting modules.
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Since it is possible to create an endless loop by having circu-
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lar file inclusions, IPython will stop if it reaches 15 recur-
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sive inclusions.
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-prompt_in1|pi1 <string>
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Specify the string used for input prompts. Note that if you are
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using numbered prompts, the number is represented with a ’\#’ in
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the string. Don’t forget to quote strings with spaces embedded
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in them. Default: ’In [\#]:’.
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Most bash-like escapes can be used to customize IPython’s
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prompts, as well as a few additional ones which are IPython-spe-
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cific. All valid prompt escapes are described in detail in the
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Customization section of the IPython HTML/PDF manual.
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-prompt_in2|pi2 <string>
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Similar to the previous option, but used for the continuation
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prompts. The special sequence ’\D’ is similar to ’\#’, but with
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all digits replaced dots (so you can have your continuation
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prompt aligned with your input prompt). Default: ’ .\D.:’
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(note three spaces at the start for alignment with ’In [\#]’).
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-prompt_out|po <string>
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String used for output prompts, also uses numbers like
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prompt_in1. Default: ’Out[\#]:’.
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-quick Start in bare bones mode (no config file loaded).
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-rcfile <name>
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Name of your IPython resource configuration file. normally
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IPython loads ipythonrc (from current directory) or
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IPYTHONDIR/ipythonrc. If the loading of your config file fails,
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IPython starts with a bare bones configuration (no modules
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loaded at all).
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-no|readline
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Use the readline library, which is needed to support name com-
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pletion and command history, among other things. It is enabled
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by default, but may cause problems for users of X/Emacs in
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Python comint or shell buffers.
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Note that emacs ’eterm’ buffers (opened with M-x term) support
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IPython’s readline and syntax coloring fine, only ’emacs’ (M-x
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shell and C-c !) buffers do not.
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-screen_length|sl <n>
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Number of lines of your screen. This is used to control print-
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ing of very long strings. Strings longer than this number of
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lines will be sent through a pager instead of directly printed.
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The default value for this is 0, which means IPython will auto-
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detect your screen size every time it needs to print certain
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potentially long strings (this doesn’t change the behavior of
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the ’print’ keyword, it’s only triggered internally). If for
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some reason this isn’t working well (it needs curses support),
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specify it yourself. Otherwise don’t change the default.
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-separate_in|si <string>
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Separator before input prompts. Default ’0.
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-separate_out|so <string>
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Separator before output prompts. Default: 0 (nothing).
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-separate_out2|so2 <string>
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Separator after output prompts. Default: 0 (nothing).
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-nosep Shorthand for ’-separate_in 0 -separate_out 0 -separate_out2 0’.
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Simply removes all input/output separators.
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-upgrade
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Allows you to upgrade your IPYTHONDIR configuration when you
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install a new version of IPython. Since new versions may
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include new command lines options or example files, this copies
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updated ipythonrc-type files. However, it backs up (with a .old
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extension) all files which it overwrites so that you can merge
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back any custimizations you might have in your personal files.
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-Version
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Print version information and exit.
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-xmode <modename>
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Mode for exception reporting. The valid modes are Plain, Con-
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text, and Verbose.
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- Plain: similar to python’s normal traceback printing.
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- Context: prints 5 lines of context source code around each
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line in the traceback.
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- Verbose: similar to Context, but additionally prints the vari-
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ables currently visible where the exception happened (shortening
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their strings if too long). This can potentially be very slow,
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if you happen to have a huge data structure whose string repre-
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sentation is complex to compute. Your computer may appear to
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freeze for a while with cpu usage at 100%. If this occurs, you
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can cancel the traceback with Ctrl-C (maybe hitting it more than
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once).
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EMBEDDING
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It is possible to start an IPython instance inside your own Python pro-
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grams. In the documentation example files there are some illustrations
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on how to do this.
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This feature allows you to evalutate dynamically the state of your
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code, operate with your variables, analyze them, etc. Note however
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that any changes you make to values while in the shell do NOT propagate
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back to the running code, so it is safe to modify your values because
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you won’t break your code in bizarre ways by doing so.
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|
"""
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cmd_line_usage = __doc__
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#---------------------------------------------------------------------------
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interactive_usage = """
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IPython -- An enhanced Interactive Python
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|
=========================================
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IPython offers a combination of convenient shell features, special commands
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and a history mechanism for both input (command history) and output (results
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|
caching, similar to Mathematica). It is intended to be a fully compatible
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|
replacement for the standard Python interpreter, while offering vastly
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improved functionality and flexibility.
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|
At your system command line, type 'ipython -help' to see the command line
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options available. This document only describes interactive features.
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Warning: IPython relies on the existence of a global variable called __IP which
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controls the shell itself. If you redefine __IP to anything, bizarre behavior
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will quickly occur.
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|
MAIN FEATURES
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* Access to the standard Python help. As of Python 2.1, a help system is
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available with access to object docstrings and the Python manuals. Simply
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type 'help' (no quotes) to access it.
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* Magic commands: type %magic for information on the magic subsystem.
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* System command aliases, via the %alias command or the ipythonrc config file.
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* Dynamic object information:
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Typing ?word or word? prints detailed information about an object. If
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certain strings in the object are too long (docstrings, code, etc.) they get
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snipped in the center for brevity.
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Typing ??word or word?? gives access to the full information without
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snipping long strings. Long strings are sent to the screen through the less
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|
pager if longer than the screen, printed otherwise.
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The ?/?? system gives access to the full source code for any object (if
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available), shows function prototypes and other useful information.
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If you just want to see an object's docstring, type '%pdoc object' (without
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quotes, and without % if you have automagic on).
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Both %pdoc and ?/?? give you access to documentation even on things which are
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not explicitely defined. Try for example typing {}.get? or after import os,
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|
type os.path.abspath??. The magic functions %pdef, %source and %file operate
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|
similarly.
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* Completion in the local namespace, by typing TAB at the prompt.
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At any time, hitting tab will complete any available python commands or
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variable names, and show you a list of the possible completions if there's
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|
no unambiguous one. It will also complete filenames in the current directory.
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|
This feature requires the readline and rlcomplete modules, so it won't work
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|
if your Python lacks readline support (such as under Windows).
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* Search previous command history in two ways (also requires readline):
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|
- Start typing, and then use Ctrl-p (previous,up) and Ctrl-n (next,down) to
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search through only the history items that match what you've typed so
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|
far. If you use Ctrl-p/Ctrl-n at a blank prompt, they just behave like
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|
normal arrow keys.
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|
- Hit Ctrl-r: opens a search prompt. Begin typing and the system searches
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|
your history for lines that match what you've typed so far, completing as
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much as it can.
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* Persistent command history across sessions (readline required).
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|
* Logging of input with the ability to save and restore a working session.
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|
* System escape with !. Typing !ls will run 'ls' in the current directory.
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|
* The reload command does a 'deep' reload of a module: changes made to the
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|
module since you imported will actually be available without having to exit.
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|
* Verbose and colored exception traceback printouts. See the magic xmode and
|
|
|
xcolor functions for details (just type %magic).
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|
|
|
|
* Input caching system:
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|
IPython offers numbered prompts (In/Out) with input and output caching. All
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|
input is saved and can be retrieved as variables (besides the usual arrow
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|
key recall).
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|
|
The following GLOBAL variables always exist (so don't overwrite them!):
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|
_i: stores previous input.
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|
_ii: next previous.
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|
|
_iii: next-next previous.
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|
_ih : a list of all input _ih[n] is the input from line n.
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|
Additionally, global variables named _i<n> are dynamically created (<n>
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|
being the prompt counter), such that _i<n> == _ih[<n>]
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|
For example, what you typed at prompt 14 is available as _i14 and _ih[14].
|
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|
|
You can create macros which contain multiple input lines from this history,
|
|
|
for later re-execution, with the %macro function.
|
|
|
|
|
|
The history function %hist allows you to see any part of your input history
|
|
|
by printing a range of the _i variables. Note that inputs which contain
|
|
|
magic functions (%) appear in the history with a prepended comment. This is
|
|
|
because they aren't really valid Python code, so you can't exec them.
|
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|
|
|
|
* Output caching system:
|
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|
|
|
|
For output that is returned from actions, a system similar to the input
|
|
|
cache exists but using _ instead of _i. Only actions that produce a result
|
|
|
(NOT assignments, for example) are cached. If you are familiar with
|
|
|
Mathematica, IPython's _ variables behave exactly like Mathematica's %
|
|
|
variables.
|
|
|
|
|
|
The following GLOBAL variables always exist (so don't overwrite them!):
|
|
|
_ (one underscore): previous output.
|
|
|
__ (two underscores): next previous.
|
|
|
___ (three underscores): next-next previous.
|
|
|
|
|
|
Global variables named _<n> are dynamically created (<n> being the prompt
|
|
|
counter), such that the result of output <n> is always available as _<n>.
|
|
|
|
|
|
Finally, a global dictionary named _oh exists with entries for all lines
|
|
|
which generated output.
|
|
|
|
|
|
* Directory history:
|
|
|
|
|
|
Your history of visited directories is kept in the global list _dh, and the
|
|
|
magic %cd command can be used to go to any entry in that list.
|
|
|
|
|
|
* Auto-parentheses and auto-quotes (adapted from Nathan Gray's LazyPython)
|
|
|
|
|
|
1. Auto-parentheses
|
|
|
Callable objects (i.e. functions, methods, etc) can be invoked like
|
|
|
this (notice the commas between the arguments):
|
|
|
>>> callable_ob arg1, arg2, arg3
|
|
|
and the input will be translated to this:
|
|
|
--> callable_ob(arg1, arg2, arg3)
|
|
|
You can force auto-parentheses by using '/' as the first character
|
|
|
of a line. For example:
|
|
|
>>> /globals # becomes 'globals()'
|
|
|
Note that the '/' MUST be the first character on the line! This
|
|
|
won't work:
|
|
|
>>> print /globals # syntax error
|
|
|
|
|
|
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):
|
|
|
In [1]: zip (1,2,3),(4,5,6) # won't work
|
|
|
but this will work:
|
|
|
In [2]: /zip (1,2,3),(4,5,6)
|
|
|
------> zip ((1,2,3),(4,5,6))
|
|
|
Out[2]= [(1, 4), (2, 5), (3, 6)]
|
|
|
|
|
|
IPython tells you that it has altered your command line by
|
|
|
displaying the new command line preceded by -->. e.g.:
|
|
|
In [18]: callable list
|
|
|
-------> callable (list)
|
|
|
|
|
|
2. Auto-Quoting
|
|
|
You can force auto-quoting of a function's arguments by using ',' as
|
|
|
the first character of a line. For example:
|
|
|
>>> ,my_function /home/me # becomes my_function("/home/me")
|
|
|
|
|
|
If you use ';' instead, the whole argument is quoted as a single
|
|
|
string (while ',' splits on whitespace):
|
|
|
>>> ,my_function a b c # becomes my_function("a","b","c")
|
|
|
>>> ;my_function a b c # becomes my_function("a b c")
|
|
|
|
|
|
Note that the ',' MUST be the first character on the line! This
|
|
|
won't work:
|
|
|
>>> x = ,my_function /home/me # syntax error
|
|
|
"""
|
|
|
|
