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Tue Jul 31 08:55:26 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-July/154867.html

On 2018-07-31 12:10, INADA Naoki wrote:
> Surely, they should understand they must use CCALL_* flags instead of
> METH_* flags when implementing fast-callable object.

Yes indeed. But implementing a fast-callable object is quite 
specialized, not something that ordinary extension writers would care 
about. And if they don't care about performance, tp_call remains supported.

More generally: with PEP 580, everything from the documented C API 
remains supported. So people can write extensions exactly as before. 
They only need to care about PEP 580 if they want to use the new 
features that PEP 580 adds (or if they used undocumented internals).

Jeroen.

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[Python-Dev] [PEP 576/580] Comparing PEP 576 and 580