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"""
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atexit.py - allow programmer to define multiple exit functions to be executed
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upon normal program termination.
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One public function, register, is defined.
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"""
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__all__ = ["register"]
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_exithandlers = []
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def _run_exitfuncs():
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"""run any registered exit functions
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_exithandlers is traversed in reverse order so functions are executed
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last in, first out.
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"""
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while _exithandlers:
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func, targs, kargs = _exithandlers.pop()
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apply(func, targs, kargs)
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def register(func, *targs, **kargs):
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"""register a function to be executed upon normal program termination
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func - function to be called at exit
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targs - optional arguments to pass to func
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kargs - optional keyword arguments to pass to func
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"""
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_exithandlers.append((func, targs, kargs))
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import sys
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if hasattr(sys, "exitfunc"):
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# Assume it's another registered exit function - append it to our list
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register(sys.exitfunc)
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sys.exitfunc = _run_exitfuncs
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del sys
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if __name__ == "__main__":
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def x1():
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print "running x1"
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def x2(n):
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print "running x2(%s)" % `n`
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def x3(n, kwd=None):
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print "running x3(%s, kwd=%s)" % (`n`, `kwd`)
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register(x1)
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register(x2, 12)
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register(x3, 5, "bar")
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register(x3, "no kwd args")
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