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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: atexit.register in case of errors
Date: Wed, 15 Feb 2012 16:31:19 -0500
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:20478

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__':
    main()
    cleanup()

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