[issue47143] Add functools.copy_class() which updates closures

[STINNER Victor]

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

It seems like the copy module doesn't support copying a class. copy.deepcopy(cls) doesn't copy a class but returns its argument, the class unchanged.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47143>
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