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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 13 Nov 2014 15:56:33 -0700
Subject: Re: How about some syntactic sugar for " __name__ == '__main__' "?
To: Python <python-list@python.org>
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On Thu, Nov 13, 2014 at 1:53 PM, Skip Montanaro
<skip.montanaro@gmail.com> wrote:
> On Thu, Nov 13, 2014 at 2:44 PM, Skip Montanaro
> <skip.montanaro@gmail.com> wrote:
>> What's not documented is
>> the behavior of calling atexit.register() while atexit._run_exitfuncs
>> is running. That's an implementation detail, and though unlikely to
>> change, it might be worthwhile getting that behavior documented.
>
> http://bugs.python.org/issue22867

In fact it seems the behavior does differ between Python 2.7 and Python 3.4:

$ cat testatexit.py
import atexit

@atexit.register
def main():
  atexit.register(goodbye)

@atexit.register
def goodbye():
  print("Goodbye")
$ python2 testatexit.py
Goodbye
Goodbye
$ python3 testatexit.py
Goodbye