/usr/lib/python3/dist-packages/IPython/frontend.py is in ipython3 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Shim to maintain backwards compatibility with old frontend imports.
We have moved all contents of the old `frontend` subpackage into top-level
subpackages (`html`, `qt` and `terminal`), and flattened the notebook into
just `IPython.html`, formerly `IPython.frontend.html.notebook`.
This will let code that was making `from IPython.frontend...` calls continue
working, though a warning will be printed.
"""
#-----------------------------------------------------------------------------
# Copyright (c) 2013, 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 sys
import types
from warnings import warn
warn("The top-level `frontend` package has been deprecated. "
"All its subpackages have been moved to the top `IPython` level.")
#-----------------------------------------------------------------------------
# Class declarations
#-----------------------------------------------------------------------------
class ShimModule(types.ModuleType):
def __init__(self, *args, **kwargs):
self._mirror = kwargs.pop("mirror")
super(ShimModule, self).__init__(*args, **kwargs)
def __getattr__(self, key):
# Use the equivalent of import_item(name), see below
name = "%s.%s" % (self._mirror, key)
# NOTE: the code below is copied *verbatim* from
# importstring.import_item. For some very strange reason that makes no
# sense to me, if we call it *as a function*, it doesn't work. This
# has something to do with the deep bowels of the import machinery and
# I couldn't find a way to make the code work as a standard function
# call. But at least since it's an unmodified copy of import_item,
# which is used extensively and has a test suite, we can be reasonably
# confident this is OK. If anyone finds how to call the function, all
# the below could be replaced simply with:
#
# from IPython.utils.importstring import import_item
# return import_item('MIRROR.' + key)
parts = name.rsplit('.', 1)
if len(parts) == 2:
# called with 'foo.bar....'
package, obj = parts
module = __import__(package, fromlist=[obj])
try:
pak = module.__dict__[obj]
except KeyError:
raise AttributeError(obj)
return pak
else:
# called with un-dotted string
return __import__(parts[0])
# Unconditionally insert the shim into sys.modules so that further import calls
# trigger the custom attribute access above
sys.modules['IPython.frontend.html.notebook'] = ShimModule('notebook', mirror='IPython.html')
sys.modules['IPython.frontend'] = ShimModule('frontend', mirror='IPython')
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