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

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

Thanks! Indeed, that's an even better solution than I had in mind.
It follows PEP 630 quite nicely: https://www.python.org/dev/peps/pep-0630/#managing-global-state

I will close this issue and PRs.
I don't agree with adding a general API for disallowing multiple modules, but do let me know if you see a need for it again.

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resolution:  -> not a bug
stage: patch review -> resolved
status: open -> closed

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