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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Title clarified.  Leaving subinterpreters aside, only one instance, AFAIK, is true for stdlib and python modules unless imported with different names, as can happen with main module (which is a nuisance if not a bug).  So only once per interpreter seems like a bugfix.  Only once per process, if once per interpreter otherwise becomes normal, seems like an enhancement, even if a necessary option.

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nosy: +terry.reedy
stage:  -> test needed
title: Add an option to disallow creating more than one instance of a module -> Add option to disallow > 1 instance of an extension module

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