atexit.register in case of errors

Terry Reedy tjreedy at
Wed Feb 15 22:31:19 CET 2012

On 2/15/2012 8:12 AM, Andrea Crotti wrote:
> I have the following very simplified situation
> from atexit import register
> def goodbye(): print("saying goodbye")
> def main():
 >   while True: var = raw_input("read something")
> if __name__ == '__main__':
 >   register(goodbye)
 >   main()
> But in my case the "goodbye" function is deleting the logging file
> which was created during the application execution. Now the problem
> is that it *always* executes, even when the applications quits for
> some bad errors.
> Is there a way to have an exit hook, which doesn't execute in case of
> errors?

Have a single no-error normal exit point.

if __name__ == '__main__':

if you really want to exit by exceptions rather than by returns,

if __name__ == '__main__':
    try: main()
    except SystemExit: normal_exit_cleanup()

Terry Jan Reedy

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