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atexit.py - allow programmer to define multiple exit functions to be executed
upon normal program termination.
One public function, register, is defined.
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_exithandlers is traversed in reverse order so functions are executed
last in, first out.
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c O s t j | | | f � | S( s register a function to be executed upon normal program termination
func - function to be called at exit
targs - optional arguments to pass to func
kargs - optional keyword arguments to pass to func
func is returned to facilitate usage as a decorator.
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