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Showing content from https://mail.python.org/pipermail/python-dev/2018-June/153909.html below:

[Python-Dev] PEP 575 (Unifying function/method classes) update

[Python-Dev] PEP 575 (Unifying function/method classes) update [Python-Dev] PEP 575 (Unifying function/method classes) updateJeroen Demeyer J.Demeyer at UGent.be
Sun Jun 17 05:00:10 EDT 2018
Hello,

I have been working on a slightly different PEP to use a new type slot 
tp_ccalloffset instead the base_function base class. You can see the 
work in progress here:

https://github.com/jdemeyer/PEP-ccall

By creating a new protocol that each class can implement, there is a 
full decoupling between the features of a class and between the class 
hierarchy (such coupling was complained about during the PEP 575 
discussion). So I got convinced that this is a better approach.

It also has the advantage that changes can be made more gradually: this 
PEP changes nothing at all on the Python side, it only changes the 
CPython implementation. I still think that it would be a good idea to 
refactor the class hierarchy, but that's now an independent issue.

Another advantage is that it's more general and easier for existing 
classes to use the protocol (PEP 575 on the other hand requires 
subclassing from base_function which may not be compatible with an 
existing class hierarchy).


Jeroen.
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