[issue37483] Add PyObject_CallOneArg()

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

> Cons: readability...

It's a single relatively short macro. I'm not worried about that. I'm more about compiler support for such macros. I'll make a PR with this idea and see what CI says.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37483>
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