[Python-Dev] C-level calling

[Jeroen Demeyer]

On 2018-06-20 08:00, Stefan Behnel wrote:
> Just to add another bit of background on top of the current discussion,
> there is an idea around, especially in the scipy/big-data community, (and
> I'm not giving any guarantees here that it will lead to a PEP +
> implementation, as it depends on people's workload) to design a dedicated C
> level calling interface for Python. Think of it as similar to the buffer
> interface, but for calling arbitrary C functions by bypassing the Python
> call interface entirely. Objects that wrap some kind of C function (and
> there are tons of them in the CPython world) would gain C signature meta
> data, maybe even for overloaded signatures, and C code that wants to call
> them could validate that meta data and call them as native C calls.

See also
https://www.python.org/dev/peps/pep-0579/#allowing-native-c-arguments

I specifically designed PEP 580 to be extendable such that it would be 
possible to add features later.