STINNER Victor <vstin...@redhat.com> added the comment:

> Variadic macros are not part of C89, so that would require changing PEP 7.

PEP 7 uses C99 since Python 3.6:
https://www.python.org/dev/peps/pep-0007/#c-dialect

> What do you think about macro like this?

Macros cannot be used in all C extensions. For the PEP 587, I was asked to 
replace macros with functions.

I would prefer a PyObject_CallOneArg() function than yet another ugly and 
dangerous macro. Sometimes, a regular function is better for stack consumption: 
it doesn't increase the stack consumption in the call site, stack memory is 
"released" once PyObject_CallOneArg() exit. In the past, I had to disable 
inlining in some functions to reduce the stack consumption. (I'm not sure if 
this optimization is still around.)

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<https://bugs.python.org/issue37483>
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