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

[STINNER Victor]

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

In the Python C API, PEP 384 added PyType_FromSpec(). There is also PyStructSequence_NewType(). PEP 3121 proposed PyType_Copy() but it was never implemented: see bpo-3760. But in C, closures are implemented using a module state, or previously using a global or static variable: cell objects are not used for types implemented in C.

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