[issue41167] Add new formats to PyArg_ParseTuple for "str or None"

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I think it is more common to use the general "O" format. In any case you need to write separate code for None and str in the body of function.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue41167>
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