[Python-Dev] Can we make METH_FASTCALL public, from Python 3.7? (ref: PEP 579

Stefan Behnel stefan_ml at behnel.de
Wed Jun 20 13:45:16 EDT 2018

Serhiy Storchaka schrieb am 20.06.2018 um 18:56:
> 20.06.18 18:42, INADA Naoki пише:
>> I don't have any idea about changing METH_FASTCALL more.
>> If Victor and Serhiy think so, and PyPy maintainers like it too, I want
>> to make it public as soon as possible.
> I don't have objections against making the METH_FASTCALL method calling
> convention public. But only for positional-only parameters, the protocol
> for keyword parameters is more complex and still can be changed.

That's also the level that Cython currently uses/supports, exactly because
keyword arguments are a) quite a bit more complex, b) a lot less often used
and c) pretty much never used in performance critical code.

Cython also currently limits the usage to Py3.6+, although I'm considering
to generally enable it for everything since Py2.6 as soon as Cython starts
using the calling convention for its own functions, just in case it ends up
calling itself without prior notice. :)


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