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Revision afa4140d9c50b9136b157f6792329d3e5e9dac0a authored by Benjamin Peterson on 24 February 2010, 02:26:59 UTC, committed by Benjamin Peterson on 24 February 2010, 02:26:59 UTC
svn+ssh://pythondev@svn.python.org/python/trunk ................ r78408 | benjamin.peterson | 2010-02-23 20:24:35 -0600 (Tue, 23 Feb 2010) | 9 lines Merged revisions 78407 via svnmerge from svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r78407 | benjamin.peterson | 2010-02-23 20:21:34 -0600 (Tue, 23 Feb 2010) | 1 line rewrite test to not rely on __doc__ being present ........ ................
1 parent 24988ab
Tip revision: afa4140d9c50b9136b157f6792329d3e5e9dac0a authored by Benjamin Peterson on 24 February 2010, 02:26:59 UTC
Merged revisions 78408 via svnmerge from
Merged revisions 78408 via svnmerge from
Tip revision: afa4140
dummy_threading.py
"""Faux ``threading`` version using ``dummy_thread`` instead of ``thread``.
The module ``_dummy_threading`` is added to ``sys.modules`` in order
to not have ``threading`` considered imported. Had ``threading`` been
directly imported it would have made all subsequent imports succeed
regardless of whether ``thread`` was available which is not desired.
"""
from sys import modules as sys_modules
import dummy_thread
# Declaring now so as to not have to nest ``try``s to get proper clean-up.
holding_thread = False
holding_threading = False
holding__threading_local = False
try:
# Could have checked if ``thread`` was not in sys.modules and gone
# a different route, but decided to mirror technique used with
# ``threading`` below.
if 'thread' in sys_modules:
held_thread = sys_modules['thread']
holding_thread = True
# Must have some module named ``thread`` that implements its API
# in order to initially import ``threading``.
sys_modules['thread'] = sys_modules['dummy_thread']
if 'threading' in sys_modules:
# If ``threading`` is already imported, might as well prevent
# trying to import it more than needed by saving it if it is
# already imported before deleting it.
held_threading = sys_modules['threading']
holding_threading = True
del sys_modules['threading']
if '_threading_local' in sys_modules:
# If ``_threading_local`` is already imported, might as well prevent
# trying to import it more than needed by saving it if it is
# already imported before deleting it.
held__threading_local = sys_modules['_threading_local']
holding__threading_local = True
del sys_modules['_threading_local']
import threading
# Need a copy of the code kept somewhere...
sys_modules['_dummy_threading'] = sys_modules['threading']
del sys_modules['threading']
sys_modules['_dummy__threading_local'] = sys_modules['_threading_local']
del sys_modules['_threading_local']
from _dummy_threading import *
from _dummy_threading import __all__
finally:
# Put back ``threading`` if we overwrote earlier
if holding_threading:
sys_modules['threading'] = held_threading
del held_threading
del holding_threading
# Put back ``_threading_local`` if we overwrote earlier
if holding__threading_local:
sys_modules['_threading_local'] = held__threading_local
del held__threading_local
del holding__threading_local
# Put back ``thread`` if we overwrote, else del the entry we made
if holding_thread:
sys_modules['thread'] = held_thread
del held_thread
else:
del sys_modules['thread']
del holding_thread
del dummy_thread
del sys_modules
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