[issue40600] Add option to disallow > 1 instance of an extension module

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I created bpo-42639 and PR 23763 to move the atexit module to PyInterpreterState and so allow to have more than one atexit instance.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40600>
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