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SF bug #690377: Dud footnote reference in distutils docs
author Raymond Hettinger <python@rcn.com>
date Fri, 21 Feb 2003 02:47:09 +0000
parents 8053bc0b8bb5
children 97768d87394a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Faux ``threading`` version using ``dummy_thread`` instead of ``thread``.
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2
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3 The module ``_dummy_threading`` is added to ``sys.modules`` in order
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4 to not have ``threading`` considered imported. Had ``threading`` been
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5 directly imported it would have made all subsequent imports succeed
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6 regardless of whether ``thread`` was available which is not desired.
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7
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8 :Author: Brett Cannon
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9 :Contact: brett@python.org
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10
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11 XXX: Try to get rid of ``_dummy_threading``.
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12
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13 """
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14 from sys import modules as sys_modules
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15
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16 import dummy_thread
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17
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18 # Declaring now so as to not have to nest ``try``s to get proper clean-up.
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19 holding_thread = False
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20 holding_threading = False
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21
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22 try:
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23 # Could have checked if ``thread`` was not in sys.modules and gone
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24 # a different route, but decided to mirror technique used with
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25 # ``threading`` below.
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26 if 'thread' in sys_modules:
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27 held_thread = sys_modules['thread']
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28 holding_thread = True
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29 # Must have some module named ``thread`` that implements its API
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30 # in order to initially import ``threading``.
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31 sys_modules['thread'] = sys_modules['dummy_thread']
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32
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33 if 'threading' in sys_modules:
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34 # If ``threading`` is already imported, might as well prevent
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35 # trying to import it more than needed by saving it if it is
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36 # already imported before deleting it.
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37 held_threading = sys_modules['threading']
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38 holding_threading = True
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39 del sys_modules['threading']
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40 import threading
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41 # Need a copy of the code kept somewhere...
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42 sys_modules['_dummy_threading'] = sys_modules['threading']
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43 del sys_modules['threading']
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44 from _dummy_threading import *
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45 from _dummy_threading import __all__
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46
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47 finally:
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48 # Put back ``threading`` if we overwrote earlier
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49 if holding_threading:
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50 sys_modules['threading'] = held_threading
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51 del held_threading
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52 del holding_threading
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53
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54 # Put back ``thread`` if we overwrote, else del the entry we made
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55 if holding_thread:
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56 sys_modules['thread'] = held_thread
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57 del held_thread
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58 else:
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59 del sys_modules['thread']
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60 del holding_thread
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61
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62 del dummy_thread
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63 del sys_modules