[Python-Dev] PEP 575: Unifying function/method classes

Jeroen Demeyer J.Demeyer at UGent.be
Thu Apr 12 12:12:02 EDT 2018

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


No substantial changes to the contents of the PEP were made compared to 
the first posting. However, many details have been changed, clarified or 
added, based on comments from the initial discussion thread and the work 
on an implementation.

My implementation is at


This is certainly not meant to be ready to merge upstream; in 
particular, the Python test suite does not fully pass. Nevertheless, it 
should be good enough to review the PEP. If the PEP would be accepted, I 
plan to continue working on the implementation, including adding tests 
and documentation.


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