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Merge pull request #2868 from takluyver/import-performance...
Merge pull request #2868 from takluyver/import-performance Import performance Defer various imports for a small reduction in startup time. IPython.lib.__init__ previously loaded IPython.lib.inputhook to export some of its functions. This meant that importing anything from IPython.lib also loaded inputhook. For now, I've just removed that import, but that is an API change, because the functions are no longer accessible as e.g. IPython.lib.enable_qt4 Added a note about the API change. Timing command, borrowed from Openoffice to simulate cold start: $ sync ; echo 3 | sudo tee /proc/sys/vm/drop_caches; time ipython3 -c pass Results with this branch: 7.68, 7.64, 7.35, 7.38 s 'real' Results with master: 8.17, 8.04, 7.81, 7.77

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skipdoctest.py
38 lines | 1.4 KiB | text/x-python | PythonLexer
"""Decorators marks that a doctest should be skipped, for both python 2 and 3.
The IPython.testing.decorators module triggers various extra imports, including
numpy and sympy if they're present. Since this decorator is used in core parts
of IPython, it's in a separate module so that running IPython doesn't trigger
those imports."""
#-----------------------------------------------------------------------------
# Copyright (C) 2009-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import sys
#-----------------------------------------------------------------------------
# Decorators
#-----------------------------------------------------------------------------
def skip_doctest(f):
"""Decorator - mark a function or method for skipping its doctest.
This decorator allows you to mark a function whose docstring you wish to
omit from testing, while preserving the docstring for introspection, help,
etc."""
f.skip_doctest = True
return f
def skip_doctest_py3(f):
"""Decorator - skip the doctest under Python 3."""
f.skip_doctest = (sys.version_info[0] >= 3)
return f