Bug report

Bug description:

There is a change in behavior in Python 3.11 that does not seem to be described in the"what's new" document.

In the following code:

classA:defmeth(self):print(self)classB:passa=A()b=B()b.meth=a.meth.__get__(b,B)b.meth()

Theb.meth() call receivesa as theself argument up to Python 3.10, butb in 3.11 and 3.12.

This pattern isused by the Pyramid framework. The change breaks Pyramid applications that useadd_request_method(someobject.somemethod, "name").

I have to admit that I do not understand the descriptor protocol (or the documentation of__get__) well enough to say whether this is a legitimate use case, but it does exist in the wild.

CPython versions tested on:

3.9, 3.10, 3.11, 3.12

Operating systems tested on:

Linux

Linked PRs

• gh-113157 gh-89519: Fix method descriptors #113233
• gh-113157: Document and test __get__ for MethodType #115492