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Mon Apr 30 09:49:43 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-April/153261.html

On 30 April 2018 at 23:38, Mark Shannon <mark at hotpy.org> wrote:

>
> On 12/04/18 17:12, Jeroen Demeyer wrote:
>
>> Dear Python developers,
>>
>> I would like to request a review of PEP 575, which is about changing the
>> classes used for built-in functions and Python functions and methods. The
>> text of the PEP can be found at
>>
>
>
> The motivation of PEP 575 is to allow introspection of built-in functions
> and to allow functions implemented in Python to be re-implemented in C.
>
> These are excellent goals.
>

That summary misses the 3rd goal, which is the one that answers your other
questions: to allow 3rd party extension modules access to the hot paths in
CPython that are currently restricted to true built-in and Python native
functions (without making those hot paths measurably slower).

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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[Python-Dev] PEP 575: Unifying function/method classes