[issue22696] Add a function to know about interpreter shutdown

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Before committing the patch it will be good to find places in the code which will benefit from this function.

And please don't forget to fix a typo in the docstring.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22696>
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