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# encoding: utf-8
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"""
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A mixin for :class:`~IPython.core.application.Application` classes that
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launch InteractiveShell instances, load extensions, etc.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import glob
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from itertools import chain
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import os
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import sys
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from traitlets.config.application import boolean_flag
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from traitlets.config.configurable import Configurable
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from traitlets.config.loader import Config
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from IPython.core.application import SYSTEM_CONFIG_DIRS, ENV_CONFIG_DIRS
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from IPython.core import pylabtools
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from IPython.utils.contexts import preserve_keys
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from IPython.utils.path import filefind
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from traitlets import (
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Unicode, Instance, List, Bool, CaselessStrEnum, observe,
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)
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from IPython.terminal import pt_inputhooks
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#-----------------------------------------------------------------------------
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# Aliases and Flags
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#-----------------------------------------------------------------------------
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gui_keys = tuple(sorted(pt_inputhooks.backends) + sorted(pt_inputhooks.aliases))
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backend_keys = sorted(pylabtools.backends.keys())
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backend_keys.insert(0, 'auto')
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shell_flags = {}
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addflag = lambda *args: shell_flags.update(boolean_flag(*args))
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addflag('autoindent', 'InteractiveShell.autoindent',
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'Turn on autoindenting.', 'Turn off autoindenting.'
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)
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addflag('automagic', 'InteractiveShell.automagic',
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"""Turn on the auto calling of magic commands. Type %%magic at the
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IPython prompt for more information.""",
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'Turn off the auto calling of magic commands.'
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)
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addflag('pdb', 'InteractiveShell.pdb',
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"Enable auto calling the pdb debugger after every exception.",
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"Disable auto calling the pdb debugger after every exception."
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)
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addflag('pprint', 'PlainTextFormatter.pprint',
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"Enable auto pretty printing of results.",
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"Disable auto pretty printing of results."
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)
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addflag('color-info', 'InteractiveShell.color_info',
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"""IPython can display information about objects via a set of functions,
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and optionally can use colors for this, syntax highlighting
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source code and various other elements. This is on by default, but can cause
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problems with some pagers. If you see such problems, you can disable the
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colours.""",
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"Disable using colors for info related things."
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)
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nosep_config = Config()
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nosep_config.InteractiveShell.separate_in = ''
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nosep_config.InteractiveShell.separate_out = ''
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nosep_config.InteractiveShell.separate_out2 = ''
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shell_flags['nosep']=(nosep_config, "Eliminate all spacing between prompts.")
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shell_flags['pylab'] = (
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{'InteractiveShellApp' : {'pylab' : 'auto'}},
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"""Pre-load matplotlib and numpy for interactive use with
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the default matplotlib backend."""
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)
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shell_flags['matplotlib'] = (
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{'InteractiveShellApp' : {'matplotlib' : 'auto'}},
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"""Configure matplotlib for interactive use with
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the default matplotlib backend."""
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)
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# it's possible we don't want short aliases for *all* of these:
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shell_aliases = dict(
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autocall='InteractiveShell.autocall',
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colors='InteractiveShell.colors',
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logfile='InteractiveShell.logfile',
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logappend='InteractiveShell.logappend',
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c='InteractiveShellApp.code_to_run',
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m='InteractiveShellApp.module_to_run',
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ext='InteractiveShellApp.extra_extension',
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gui='InteractiveShellApp.gui',
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pylab='InteractiveShellApp.pylab',
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matplotlib='InteractiveShellApp.matplotlib',
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)
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shell_aliases['cache-size'] = 'InteractiveShell.cache_size'
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#-----------------------------------------------------------------------------
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# Main classes and functions
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#-----------------------------------------------------------------------------
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class InteractiveShellApp(Configurable):
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"""A Mixin for applications that start InteractiveShell instances.
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Provides configurables for loading extensions and executing files
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as part of configuring a Shell environment.
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The following methods should be called by the :meth:`initialize` method
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of the subclass:
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- :meth:`init_path`
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- :meth:`init_shell` (to be implemented by the subclass)
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- :meth:`init_gui_pylab`
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- :meth:`init_extensions`
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- :meth:`init_code`
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"""
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extensions = List(Unicode(),
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help="A list of dotted module names of IPython extensions to load."
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).tag(config=True)
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extra_extension = Unicode('',
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help="dotted module name of an IPython extension to load."
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).tag(config=True)
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reraise_ipython_extension_failures = Bool(False,
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help="Reraise exceptions encountered loading IPython extensions?",
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).tag(config=True)
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# Extensions that are always loaded (not configurable)
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default_extensions = List(Unicode(), [u'storemagic']).tag(config=False)
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hide_initial_ns = Bool(True,
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help="""Should variables loaded at startup (by startup files, exec_lines, etc.)
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be hidden from tools like %who?"""
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).tag(config=True)
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exec_files = List(Unicode(),
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help="""List of files to run at IPython startup."""
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).tag(config=True)
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exec_PYTHONSTARTUP = Bool(True,
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help="""Run the file referenced by the PYTHONSTARTUP environment
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variable at IPython startup."""
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).tag(config=True)
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file_to_run = Unicode('',
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help="""A file to be run""").tag(config=True)
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exec_lines = List(Unicode(),
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help="""lines of code to run at IPython startup."""
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).tag(config=True)
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code_to_run = Unicode('',
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help="Execute the given command string."
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).tag(config=True)
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module_to_run = Unicode('',
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help="Run the module as a script."
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).tag(config=True)
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gui = CaselessStrEnum(gui_keys, allow_none=True,
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help="Enable GUI event loop integration with any of {0}.".format(gui_keys)
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).tag(config=True)
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matplotlib = CaselessStrEnum(backend_keys, allow_none=True,
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help="""Configure matplotlib for interactive use with
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the default matplotlib backend."""
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).tag(config=True)
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pylab = CaselessStrEnum(backend_keys, allow_none=True,
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help="""Pre-load matplotlib and numpy for interactive use,
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selecting a particular matplotlib backend and loop integration.
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"""
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).tag(config=True)
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pylab_import_all = Bool(True,
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help="""If true, IPython will populate the user namespace with numpy, pylab, etc.
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and an ``import *`` is done from numpy and pylab, when using pylab mode.
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When False, pylab mode should not import any names into the user namespace.
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"""
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).tag(config=True)
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shell = Instance('IPython.core.interactiveshell.InteractiveShellABC',
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allow_none=True)
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# whether interact-loop should start
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interact = Bool(True)
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user_ns = Instance(dict, args=None, allow_none=True)
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@observe('user_ns')
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def _user_ns_changed(self, change):
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if self.shell is not None:
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self.shell.user_ns = change['new']
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self.shell.init_user_ns()
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def init_path(self):
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"""Add current working directory, '', to sys.path
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Unlike Python's default, we insert before the first `site-packages`
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or `dist-packages` directory,
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so that it is after the standard library.
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.. versionchanged:: 7.2
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Try to insert after the standard library, instead of first.
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"""
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if '' in sys.path:
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return
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for idx, path in enumerate(sys.path):
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parent, last_part = os.path.split(path)
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if last_part in {'site-packages', 'dist-packages'}:
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break
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else:
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# no site-packages or dist-packages found (?!)
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# back to original behavior of inserting at the front
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idx = 0
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sys.path.insert(idx, '')
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def init_shell(self):
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raise NotImplementedError("Override in subclasses")
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def init_gui_pylab(self):
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"""Enable GUI event loop integration, taking pylab into account."""
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enable = False
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shell = self.shell
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if self.pylab:
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enable = lambda key: shell.enable_pylab(key, import_all=self.pylab_import_all)
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key = self.pylab
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elif self.matplotlib:
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enable = shell.enable_matplotlib
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key = self.matplotlib
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elif self.gui:
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enable = shell.enable_gui
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key = self.gui
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if not enable:
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return
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try:
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r = enable(key)
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except ImportError:
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self.log.warning("Eventloop or matplotlib integration failed. Is matplotlib installed?")
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self.shell.showtraceback()
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return
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except Exception:
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self.log.warning("GUI event loop or pylab initialization failed")
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self.shell.showtraceback()
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return
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if isinstance(r, tuple):
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gui, backend = r[:2]
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self.log.info("Enabling GUI event loop integration, "
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"eventloop=%s, matplotlib=%s", gui, backend)
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if key == "auto":
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print("Using matplotlib backend: %s" % backend)
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else:
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gui = r
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self.log.info("Enabling GUI event loop integration, "
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"eventloop=%s", gui)
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def init_extensions(self):
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"""Load all IPython extensions in IPythonApp.extensions.
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This uses the :meth:`ExtensionManager.load_extensions` to load all
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the extensions listed in ``self.extensions``.
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"""
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try:
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self.log.debug("Loading IPython extensions...")
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extensions = self.default_extensions + self.extensions
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if self.extra_extension:
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extensions.append(self.extra_extension)
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for ext in extensions:
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try:
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self.log.info("Loading IPython extension: %s" % ext)
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self.shell.extension_manager.load_extension(ext)
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except:
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if self.reraise_ipython_extension_failures:
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raise
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msg = ("Error in loading extension: {ext}\n"
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"Check your config files in {location}".format(
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ext=ext,
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location=self.profile_dir.location
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))
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self.log.warning(msg, exc_info=True)
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except:
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if self.reraise_ipython_extension_failures:
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raise
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self.log.warning("Unknown error in loading extensions:", exc_info=True)
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def init_code(self):
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"""run the pre-flight code, specified via exec_lines"""
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self._run_startup_files()
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self._run_exec_lines()
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self._run_exec_files()
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# Hide variables defined here from %who etc.
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if self.hide_initial_ns:
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self.shell.user_ns_hidden.update(self.shell.user_ns)
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# command-line execution (ipython -i script.py, ipython -m module)
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# should *not* be excluded from %whos
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self._run_cmd_line_code()
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self._run_module()
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# flush output, so itwon't be attached to the first cell
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sys.stdout.flush()
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sys.stderr.flush()
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def _run_exec_lines(self):
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"""Run lines of code in IPythonApp.exec_lines in the user's namespace."""
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if not self.exec_lines:
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return
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try:
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self.log.debug("Running code from IPythonApp.exec_lines...")
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for line in self.exec_lines:
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try:
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self.log.info("Running code in user namespace: %s" %
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line)
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self.shell.run_cell(line, store_history=False)
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except:
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self.log.warning("Error in executing line in user "
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"namespace: %s" % line)
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self.shell.showtraceback()
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except:
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self.log.warning("Unknown error in handling IPythonApp.exec_lines:")
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self.shell.showtraceback()
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def _exec_file(self, fname, shell_futures=False):
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try:
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full_filename = filefind(fname, [u'.', self.ipython_dir])
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except IOError:
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self.log.warning("File not found: %r"%fname)
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return
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# Make sure that the running script gets a proper sys.argv as if it
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# were run from a system shell.
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save_argv = sys.argv
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sys.argv = [full_filename] + self.extra_args[1:]
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try:
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if os.path.isfile(full_filename):
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self.log.info("Running file in user namespace: %s" %
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full_filename)
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# Ensure that __file__ is always defined to match Python
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# behavior.
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with preserve_keys(self.shell.user_ns, '__file__'):
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self.shell.user_ns['__file__'] = fname
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if full_filename.endswith('.ipy') or full_filename.endswith('.ipynb'):
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self.shell.safe_execfile_ipy(full_filename,
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shell_futures=shell_futures)
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else:
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# default to python, even without extension
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self.shell.safe_execfile(full_filename,
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self.shell.user_ns,
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shell_futures=shell_futures,
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raise_exceptions=True)
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finally:
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sys.argv = save_argv
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def _run_startup_files(self):
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"""Run files from profile startup directory"""
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startup_dirs = [self.profile_dir.startup_dir] + [
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os.path.join(p, 'startup') for p in chain(ENV_CONFIG_DIRS, SYSTEM_CONFIG_DIRS)
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]
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startup_files = []
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if self.exec_PYTHONSTARTUP and os.environ.get('PYTHONSTARTUP', False) and \
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not (self.file_to_run or self.code_to_run or self.module_to_run):
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python_startup = os.environ['PYTHONSTARTUP']
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self.log.debug("Running PYTHONSTARTUP file %s...", python_startup)
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try:
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self._exec_file(python_startup)
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except:
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self.log.warning("Unknown error in handling PYTHONSTARTUP file %s:", python_startup)
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self.shell.showtraceback()
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for startup_dir in startup_dirs[::-1]:
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startup_files += glob.glob(os.path.join(startup_dir, '*.py'))
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startup_files += glob.glob(os.path.join(startup_dir, '*.ipy'))
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if not startup_files:
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return
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self.log.debug("Running startup files from %s...", startup_dir)
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try:
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for fname in sorted(startup_files):
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self._exec_file(fname)
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except:
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self.log.warning("Unknown error in handling startup files:")
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self.shell.showtraceback()
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def _run_exec_files(self):
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"""Run files from IPythonApp.exec_files"""
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if not self.exec_files:
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return
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self.log.debug("Running files in IPythonApp.exec_files...")
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try:
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for fname in self.exec_files:
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self._exec_file(fname)
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except:
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self.log.warning("Unknown error in handling IPythonApp.exec_files:")
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self.shell.showtraceback()
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def _run_cmd_line_code(self):
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"""Run code or file specified at the command-line"""
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if self.code_to_run:
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line = self.code_to_run
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try:
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self.log.info("Running code given at command line (c=): %s" %
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line)
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self.shell.run_cell(line, store_history=False)
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except:
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self.log.warning("Error in executing line in user namespace: %s" %
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line)
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self.shell.showtraceback()
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if not self.interact:
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self.exit(1)
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|
# Like Python itself, ignore the second if the first of these is present
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|
elif self.file_to_run:
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|
fname = self.file_to_run
|
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|
if os.path.isdir(fname):
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|
fname = os.path.join(fname, "__main__.py")
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try:
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self._exec_file(fname, shell_futures=True)
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except:
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self.shell.showtraceback(tb_offset=4)
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|
if not self.interact:
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self.exit(1)
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def _run_module(self):
|
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|
"""Run module specified at the command-line."""
|
|
|
if self.module_to_run:
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|
|
# Make sure that the module gets a proper sys.argv as if it were
|
|
|
# run using `python -m`.
|
|
|
save_argv = sys.argv
|
|
|
sys.argv = [sys.executable] + self.extra_args
|
|
|
try:
|
|
|
self.shell.safe_run_module(self.module_to_run,
|
|
|
self.shell.user_ns)
|
|
|
finally:
|
|
|
sys.argv = save_argv
|
|
|
|
