basic.py
538 lines
| 19.4 KiB
| text/x-python
|
PythonLexer
Fernando Perez
|
r6959 | """Implementation of basic magic functions. | ||
""" | ||||
#----------------------------------------------------------------------------- | ||||
# Copyright (c) 2012 The IPython Development Team. | ||||
# | ||||
# Distributed under the terms of the Modified BSD License. | ||||
# | ||||
# The full license is in the file COPYING.txt, distributed with this software. | ||||
#----------------------------------------------------------------------------- | ||||
#----------------------------------------------------------------------------- | ||||
# Imports | ||||
#----------------------------------------------------------------------------- | ||||
from __future__ import print_function | ||||
# Stdlib | ||||
import io | ||||
import sys | ||||
from pprint import pformat | ||||
# Our own packages | ||||
from IPython.core.error import UsageError | ||||
Fernando Perez
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r6973 | from IPython.core.magic import Magics, magics_class, line_magic | ||
Fernando Perez
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r6959 | from IPython.core.prefilter import ESC_MAGIC | ||
from IPython.utils.text import format_screen | ||||
from IPython.core import magic_arguments, page | ||||
from IPython.testing.skipdoctest import skip_doctest | ||||
from IPython.utils.ipstruct import Struct | ||||
from IPython.utils.path import unquote_filename | ||||
from IPython.utils.warn import warn, error | ||||
#----------------------------------------------------------------------------- | ||||
# Magics class implementation | ||||
#----------------------------------------------------------------------------- | ||||
Fernando Perez
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r6973 | @magics_class | ||
Fernando Perez
|
r6959 | class BasicMagics(Magics): | ||
"""Magics that provide central IPython functionality. | ||||
These are various magics that don't fit into specific categories but that | ||||
are all part of the base 'IPython experience'.""" | ||||
def _lsmagic(self): | ||||
mesc = ESC_MAGIC | ||||
cesc = mesc*2 | ||||
mman = self.shell.magics_manager | ||||
magics = mman.lsmagic() | ||||
out = ['Available line magics:', | ||||
mesc + (' '+mesc).join(magics['line']), | ||||
'', | ||||
'Available cell magics:', | ||||
cesc + (' '+cesc).join(magics['cell']), | ||||
'', | ||||
mman.auto_status()] | ||||
return '\n'.join(out) | ||||
@line_magic | ||||
def lsmagic(self, parameter_s=''): | ||||
"""List currently available magic functions.""" | ||||
print(self._lsmagic()) | ||||
@line_magic | ||||
def magic(self, parameter_s=''): | ||||
"""Print information about the magic function system. | ||||
Supported formats: -latex, -brief, -rest | ||||
""" | ||||
mode = '' | ||||
try: | ||||
mode = parameter_s.split()[0][1:] | ||||
if mode == 'rest': | ||||
rest_docs = [] | ||||
Fernando Perez
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r6986 | except IndexError: | ||
Fernando Perez
|
r6959 | pass | ||
magic_docs = [] | ||||
escapes = dict(line=ESC_MAGIC, cell=ESC_MAGIC*2) | ||||
magics = self.shell.magics_manager.magics | ||||
for mtype in ('line', 'cell'): | ||||
escape = escapes[mtype] | ||||
for fname, fn in magics[mtype].iteritems(): | ||||
if mode == 'brief': | ||||
# only first line | ||||
if fn.__doc__: | ||||
fndoc = fn.__doc__.split('\n',1)[0] | ||||
else: | ||||
fndoc = 'No documentation' | ||||
else: | ||||
if fn.__doc__: | ||||
fndoc = fn.__doc__.rstrip() | ||||
else: | ||||
fndoc = 'No documentation' | ||||
if mode == 'rest': | ||||
rest_docs.append('**%s%s**::\n\n\t%s\n\n' % | ||||
(escape, fname, fndoc)) | ||||
else: | ||||
magic_docs.append('%s%s:\n\t%s\n' % | ||||
(escape, fname, fndoc)) | ||||
magic_docs = ''.join(magic_docs) | ||||
if mode == 'rest': | ||||
return "".join(rest_docs) | ||||
if mode == 'latex': | ||||
print(self.format_latex(magic_docs)) | ||||
return | ||||
else: | ||||
magic_docs = format_screen(magic_docs) | ||||
if mode == 'brief': | ||||
return magic_docs | ||||
out = [""" | ||||
IPython's 'magic' functions | ||||
=========================== | ||||
The magic function system provides a series of functions which allow you to | ||||
control the behavior of IPython itself, plus a lot of system-type | ||||
Fernando Perez
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r7005 | features. There are two kinds of magics, line-oriented and cell-oriented. | ||
Line magics are prefixed with the % character and work much like OS | ||||
command-line calls: they get as an argument the rest of the line, where | ||||
arguments are passed without parentheses or quotes. For example, this will | ||||
time the given statement:: | ||||
%timeit range(1000) | ||||
Cell magics are prefixed with a double %%, and they are functions that get as | ||||
an argument not only the rest of the line, but also the lines below it in a | ||||
separate argument. These magics are called with two arguments: the rest of the | ||||
call line and the body of the cell, consisting of the lines below the first. | ||||
For example:: | ||||
%%timeit x = numpy.random.randn((100, 100)) | ||||
numpy.linalg.svd(x) | ||||
will time the execution of the numpy svd routine, running the assignment of x | ||||
as part of the setup phase, which is not timed. | ||||
In a line-oriented client (the terminal or Qt console IPython), starting a new | ||||
input with %% will automatically enter cell mode, and IPython will continue | ||||
reading input until a blank line is given. In the notebook, simply type the | ||||
whole cell as one entity, but keep in mind that the %% escape can only be at | ||||
the very start of the cell. | ||||
Fernando Perez
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r6959 | |||
NOTE: If you have 'automagic' enabled (via the command line option or with the | ||||
Fernando Perez
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r7005 | %automagic function), you don't need to type in the % explicitly for line | ||
magics; cell magics always require an explicit '%%' escape. By default, | ||||
Fernando Perez
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r6959 | IPython ships with automagic on, so you should only rarely need the % escape. | ||
Example: typing '%cd mydir' (without the quotes) changes you working directory | ||||
to 'mydir', if it exists. | ||||
For a list of the available magic functions, use %lsmagic. For a description | ||||
of any of them, type %magic_name?, e.g. '%cd?'. | ||||
Currently the magic system has the following functions:""", | ||||
magic_docs, | ||||
"Summary of magic functions (from %slsmagic):", | ||||
self._lsmagic(), | ||||
] | ||||
page.page('\n'.join(out)) | ||||
@line_magic | ||||
def page(self, parameter_s=''): | ||||
"""Pretty print the object and display it through a pager. | ||||
%page [options] OBJECT | ||||
If no object is given, use _ (last output). | ||||
Options: | ||||
-r: page str(object), don't pretty-print it.""" | ||||
# After a function contributed by Olivier Aubert, slightly modified. | ||||
# Process options/args | ||||
opts, args = self.parse_options(parameter_s, 'r') | ||||
raw = 'r' in opts | ||||
oname = args and args or '_' | ||||
info = self._ofind(oname) | ||||
if info['found']: | ||||
txt = (raw and str or pformat)( info['obj'] ) | ||||
page.page(txt) | ||||
else: | ||||
print('Object `%s` not found' % oname) | ||||
@line_magic | ||||
def profile(self, parameter_s=''): | ||||
"""Print your currently active IPython profile.""" | ||||
from IPython.core.application import BaseIPythonApplication | ||||
if BaseIPythonApplication.initialized(): | ||||
print(BaseIPythonApplication.instance().profile) | ||||
else: | ||||
error("profile is an application-level value, but you don't appear to be in an IPython application") | ||||
@line_magic | ||||
def pprint(self, parameter_s=''): | ||||
"""Toggle pretty printing on/off.""" | ||||
ptformatter = self.shell.display_formatter.formatters['text/plain'] | ||||
ptformatter.pprint = bool(1 - ptformatter.pprint) | ||||
print('Pretty printing has been turned', | ||||
['OFF','ON'][ptformatter.pprint]) | ||||
@line_magic | ||||
def colors(self, parameter_s=''): | ||||
"""Switch color scheme for prompts, info system and exception handlers. | ||||
Currently implemented schemes: NoColor, Linux, LightBG. | ||||
Color scheme names are not case-sensitive. | ||||
Examples | ||||
-------- | ||||
To get a plain black and white terminal:: | ||||
%colors nocolor | ||||
""" | ||||
def color_switch_err(name): | ||||
warn('Error changing %s color schemes.\n%s' % | ||||
(name, sys.exc_info()[1])) | ||||
new_scheme = parameter_s.strip() | ||||
if not new_scheme: | ||||
raise UsageError( | ||||
"%colors: you must specify a color scheme. See '%colors?'") | ||||
return | ||||
# local shortcut | ||||
shell = self.shell | ||||
import IPython.utils.rlineimpl as readline | ||||
if not shell.colors_force and \ | ||||
not readline.have_readline and sys.platform == "win32": | ||||
msg = """\ | ||||
Proper color support under MS Windows requires the pyreadline library. | ||||
You can find it at: | ||||
http://ipython.org/pyreadline.html | ||||
Gary's readline needs the ctypes module, from: | ||||
http://starship.python.net/crew/theller/ctypes | ||||
(Note that ctypes is already part of Python versions 2.5 and newer). | ||||
Defaulting color scheme to 'NoColor'""" | ||||
new_scheme = 'NoColor' | ||||
warn(msg) | ||||
# readline option is 0 | ||||
if not shell.colors_force and not shell.has_readline: | ||||
new_scheme = 'NoColor' | ||||
# Set prompt colors | ||||
try: | ||||
shell.prompt_manager.color_scheme = new_scheme | ||||
except: | ||||
color_switch_err('prompt') | ||||
else: | ||||
shell.colors = \ | ||||
shell.prompt_manager.color_scheme_table.active_scheme_name | ||||
# Set exception colors | ||||
try: | ||||
shell.InteractiveTB.set_colors(scheme = new_scheme) | ||||
shell.SyntaxTB.set_colors(scheme = new_scheme) | ||||
except: | ||||
color_switch_err('exception') | ||||
# Set info (for 'object?') colors | ||||
if shell.color_info: | ||||
try: | ||||
shell.inspector.set_active_scheme(new_scheme) | ||||
except: | ||||
color_switch_err('object inspector') | ||||
else: | ||||
shell.inspector.set_active_scheme('NoColor') | ||||
@line_magic | ||||
def xmode(self, parameter_s=''): | ||||
"""Switch modes for the exception handlers. | ||||
Valid modes: Plain, Context and Verbose. | ||||
If called without arguments, acts as a toggle.""" | ||||
def xmode_switch_err(name): | ||||
warn('Error changing %s exception modes.\n%s' % | ||||
(name,sys.exc_info()[1])) | ||||
shell = self.shell | ||||
new_mode = parameter_s.strip().capitalize() | ||||
try: | ||||
shell.InteractiveTB.set_mode(mode=new_mode) | ||||
print('Exception reporting mode:',shell.InteractiveTB.mode) | ||||
except: | ||||
xmode_switch_err('user') | ||||
@line_magic | ||||
def quickref(self,arg): | ||||
""" Show a quick reference sheet """ | ||||
from IPython.core.usage import quick_reference | ||||
qr = quick_reference + self.magic('-brief') | ||||
page.page(qr) | ||||
@line_magic | ||||
def doctest_mode(self, parameter_s=''): | ||||
"""Toggle doctest mode on and off. | ||||
This mode is intended to make IPython behave as much as possible like a | ||||
plain Python shell, from the perspective of how its prompts, exceptions | ||||
and output look. This makes it easy to copy and paste parts of a | ||||
session into doctests. It does so by: | ||||
- Changing the prompts to the classic ``>>>`` ones. | ||||
- Changing the exception reporting mode to 'Plain'. | ||||
- Disabling pretty-printing of output. | ||||
Note that IPython also supports the pasting of code snippets that have | ||||
leading '>>>' and '...' prompts in them. This means that you can paste | ||||
doctests from files or docstrings (even if they have leading | ||||
whitespace), and the code will execute correctly. You can then use | ||||
'%history -t' to see the translated history; this will give you the | ||||
input after removal of all the leading prompts and whitespace, which | ||||
can be pasted back into an editor. | ||||
With these features, you can switch into this mode easily whenever you | ||||
need to do testing and changes to doctests, without having to leave | ||||
your existing IPython session. | ||||
""" | ||||
# Shorthands | ||||
shell = self.shell | ||||
pm = shell.prompt_manager | ||||
meta = shell.meta | ||||
disp_formatter = self.shell.display_formatter | ||||
ptformatter = disp_formatter.formatters['text/plain'] | ||||
# dstore is a data store kept in the instance metadata bag to track any | ||||
# changes we make, so we can undo them later. | ||||
dstore = meta.setdefault('doctest_mode',Struct()) | ||||
save_dstore = dstore.setdefault | ||||
# save a few values we'll need to recover later | ||||
mode = save_dstore('mode',False) | ||||
save_dstore('rc_pprint',ptformatter.pprint) | ||||
save_dstore('xmode',shell.InteractiveTB.mode) | ||||
save_dstore('rc_separate_out',shell.separate_out) | ||||
save_dstore('rc_separate_out2',shell.separate_out2) | ||||
save_dstore('rc_prompts_pad_left',pm.justify) | ||||
save_dstore('rc_separate_in',shell.separate_in) | ||||
save_dstore('rc_plain_text_only',disp_formatter.plain_text_only) | ||||
save_dstore('prompt_templates',(pm.in_template, pm.in2_template, pm.out_template)) | ||||
if mode == False: | ||||
# turn on | ||||
pm.in_template = '>>> ' | ||||
pm.in2_template = '... ' | ||||
pm.out_template = '' | ||||
# Prompt separators like plain python | ||||
shell.separate_in = '' | ||||
shell.separate_out = '' | ||||
shell.separate_out2 = '' | ||||
pm.justify = False | ||||
ptformatter.pprint = False | ||||
disp_formatter.plain_text_only = True | ||||
shell.magic('xmode Plain') | ||||
else: | ||||
# turn off | ||||
pm.in_template, pm.in2_template, pm.out_template = dstore.prompt_templates | ||||
shell.separate_in = dstore.rc_separate_in | ||||
shell.separate_out = dstore.rc_separate_out | ||||
shell.separate_out2 = dstore.rc_separate_out2 | ||||
pm.justify = dstore.rc_prompts_pad_left | ||||
ptformatter.pprint = dstore.rc_pprint | ||||
disp_formatter.plain_text_only = dstore.rc_plain_text_only | ||||
shell.magic('xmode ' + dstore.xmode) | ||||
# Store new mode and inform | ||||
dstore.mode = bool(1-int(mode)) | ||||
mode_label = ['OFF','ON'][dstore.mode] | ||||
print('Doctest mode is:', mode_label) | ||||
@line_magic | ||||
def gui(self, parameter_s=''): | ||||
"""Enable or disable IPython GUI event loop integration. | ||||
%gui [GUINAME] | ||||
This magic replaces IPython's threaded shells that were activated | ||||
using the (pylab/wthread/etc.) command line flags. GUI toolkits | ||||
can now be enabled at runtime and keyboard | ||||
interrupts should work without any problems. The following toolkits | ||||
are supported: wxPython, PyQt4, PyGTK, Tk and Cocoa (OSX):: | ||||
%gui wx # enable wxPython event loop integration | ||||
%gui qt4|qt # enable PyQt4 event loop integration | ||||
%gui gtk # enable PyGTK event loop integration | ||||
%gui gtk3 # enable Gtk3 event loop integration | ||||
%gui tk # enable Tk event loop integration | ||||
%gui OSX # enable Cocoa event loop integration | ||||
# (requires %matplotlib 1.1) | ||||
%gui # disable all event loop integration | ||||
WARNING: after any of these has been called you can simply create | ||||
an application object, but DO NOT start the event loop yourself, as | ||||
we have already handled that. | ||||
""" | ||||
opts, arg = self.parse_options(parameter_s, '') | ||||
if arg=='': arg = None | ||||
try: | ||||
MinRK
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r7091 | return self.shell.enable_gui(arg) | ||
Fernando Perez
|
r6959 | except Exception as e: | ||
# print simple error message, rather than traceback if we can't | ||||
# hook up the GUI | ||||
error(str(e)) | ||||
@skip_doctest | ||||
@line_magic | ||||
def precision(self, s=''): | ||||
"""Set floating point precision for pretty printing. | ||||
Can set either integer precision or a format string. | ||||
If numpy has been imported and precision is an int, | ||||
numpy display precision will also be set, via ``numpy.set_printoptions``. | ||||
If no argument is given, defaults will be restored. | ||||
Examples | ||||
-------- | ||||
:: | ||||
In [1]: from math import pi | ||||
In [2]: %precision 3 | ||||
Out[2]: u'%.3f' | ||||
In [3]: pi | ||||
Out[3]: 3.142 | ||||
In [4]: %precision %i | ||||
Out[4]: u'%i' | ||||
In [5]: pi | ||||
Out[5]: 3 | ||||
In [6]: %precision %e | ||||
Out[6]: u'%e' | ||||
In [7]: pi**10 | ||||
Out[7]: 9.364805e+04 | ||||
In [8]: %precision | ||||
Out[8]: u'%r' | ||||
In [9]: pi**10 | ||||
Out[9]: 93648.047476082982 | ||||
""" | ||||
ptformatter = self.shell.display_formatter.formatters['text/plain'] | ||||
ptformatter.float_precision = s | ||||
return ptformatter.float_format | ||||
@magic_arguments.magic_arguments() | ||||
@magic_arguments.argument( | ||||
'-e', '--export', action='store_true', default=False, | ||||
help='Export IPython history as a notebook. The filename argument ' | ||||
'is used to specify the notebook name and format. For example ' | ||||
'a filename of notebook.ipynb will result in a notebook name ' | ||||
'of "notebook" and a format of "xml". Likewise using a ".json" ' | ||||
'or ".py" file extension will write the notebook in the json ' | ||||
'or py formats.' | ||||
) | ||||
@magic_arguments.argument( | ||||
'-f', '--format', | ||||
help='Convert an existing IPython notebook to a new format. This option ' | ||||
'specifies the new format and can have the values: xml, json, py. ' | ||||
'The target filename is chosen automatically based on the new ' | ||||
'format. The filename argument gives the name of the source file.' | ||||
) | ||||
@magic_arguments.argument( | ||||
'filename', type=unicode, | ||||
help='Notebook name or filename' | ||||
) | ||||
@line_magic | ||||
def notebook(self, s): | ||||
"""Export and convert IPython notebooks. | ||||
This function can export the current IPython history to a notebook file | ||||
or can convert an existing notebook file into a different format. For | ||||
example, to export the history to "foo.ipynb" do "%notebook -e foo.ipynb". | ||||
To export the history to "foo.py" do "%notebook -e foo.py". To convert | ||||
"foo.ipynb" to "foo.json" do "%notebook -f json foo.ipynb". Possible | ||||
formats include (json/ipynb, py). | ||||
""" | ||||
args = magic_arguments.parse_argstring(self.notebook, s) | ||||
from IPython.nbformat import current | ||||
args.filename = unquote_filename(args.filename) | ||||
if args.export: | ||||
fname, name, format = current.parse_filename(args.filename) | ||||
cells = [] | ||||
hist = list(self.shell.history_manager.get_range()) | ||||
for session, prompt_number, input in hist[:-1]: | ||||
cells.append(current.new_code_cell(prompt_number=prompt_number, | ||||
input=input)) | ||||
worksheet = current.new_worksheet(cells=cells) | ||||
nb = current.new_notebook(name=name,worksheets=[worksheet]) | ||||
with io.open(fname, 'w', encoding='utf-8') as f: | ||||
current.write(nb, f, format); | ||||
elif args.format is not None: | ||||
old_fname, old_name, old_format = current.parse_filename(args.filename) | ||||
new_format = args.format | ||||
if new_format == u'xml': | ||||
raise ValueError('Notebooks cannot be written as xml.') | ||||
elif new_format == u'ipynb' or new_format == u'json': | ||||
new_fname = old_name + u'.ipynb' | ||||
new_format = u'json' | ||||
elif new_format == u'py': | ||||
new_fname = old_name + u'.py' | ||||
else: | ||||
raise ValueError('Invalid notebook format: %s' % new_format) | ||||
with io.open(old_fname, 'r', encoding='utf-8') as f: | ||||
nb = current.read(f, old_format) | ||||
with io.open(new_fname, 'w', encoding='utf-8') as f: | ||||
current.write(nb, f, new_format) | ||||