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Sun Jun 17 10:31:36 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-June/153913.html

Ronald Oussoren schrieb am 17.06.2018 um 14:50:
> Why did you add a tp_ccalloffset slot to the type with the actual information in instances instead of storing the information in a slot? 

If the configuration of the callable was in the type, you would need a
separate type for each kind of callable. That would quickly explode. Think
of this as a generalised PyCFunction interface to arbitrary callables.
There is a function pointer and some meta data, and both are specific to an
instance.

Also, there are usually only a limited number of callables around, so
memory doesn't matter. (And memory usage would be a striking reason to have
something in a type rather than an instance.)

Stefan

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