[issue43753] [C API] Add Py_Is(x, y) and Py_IsNone(x) functions

[STINNER Victor]

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

> I tried applying this API on an extension, and I found the code to be slightly less readable for the "is not" cases.

FYI you can try upgrade_pythoncapi.py on your project using the following PR to update code to use Py_IsNone/Py_IsTrue/Py_IsFalse:
https://github.com/pythoncapi/pythoncapi_compat/pull/8

For example, use "upgrade_pythoncapi.py -o Py_Is directory/" or "upgrade_pythoncapi.py -o Py_Is file.c".

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