Mercurial > cpython-lru_cache-weakref

annotate Lib/atexit.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents ba563ab7a57a
children 4cdf21a0dbbc
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1 """
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2 atexit.py - allow programmer to define multiple exit functions to be executed
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3 upon normal program termination.
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4
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5 One public function, register, is defined.
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6 """
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7
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8 __all__ = ["register"]
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9
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10 import sys
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11
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12 _exithandlers = []
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13 def _run_exitfuncs():
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14 """run any registered exit functions
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15
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16 _exithandlers is traversed in reverse order so functions are executed
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17 last in, first out.
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18 """
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19
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20 exc_info = None
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21 while _exithandlers:
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22 func, targs, kargs = _exithandlers.pop()
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23 try:
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24 func(*targs, **kargs)
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25 except SystemExit:
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26 exc_info = sys.exc_info()
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27 except:
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28 import traceback
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29 print >> sys.stderr, "Error in atexit._run_exitfuncs:"
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30 traceback.print_exc()
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31 exc_info = sys.exc_info()
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32
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33 if exc_info is not None:
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34 raise exc_info[0], exc_info[1], exc_info[2]
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35
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36
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37 def register(func, *targs, **kargs):
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38 """register a function to be executed upon normal program termination
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39
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40 func - function to be called at exit
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41 targs - optional arguments to pass to func
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42 kargs - optional keyword arguments to pass to func
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43
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44 func is returned to facilitate usage as a decorator.
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45 """
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46 _exithandlers.append((func, targs, kargs))
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47 return func
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48
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49 if hasattr(sys, "exitfunc"):
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50 # Assume it's another registered exit function - append it to our list
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51 register(sys.exitfunc)
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52 sys.exitfunc = _run_exitfuncs
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54 if __name__ == "__main__":
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55 def x1():
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56 print "running x1"
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57 def x2(n):
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58 print "running x2(%r)" % (n,)
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59 def x3(n, kwd=None):
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60 print "running x3(%r, kwd=%r)" % (n, kwd)
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62 register(x1)
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63 register(x2, 12)
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64 register(x3, 5, "bar")
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65 register(x3, "no kwd args")