Bug report

Bug description:

from functools import update_wrapper

def my_type(*args): pass

t = update_wrapper(my_type, type)

This works on Python ≤ 3.11, and I think this is expected because the docs for update_wrapper claim that it may be used with callables other than functions.

However, with 3.12, I get

TypeError: __type_params__ must be set to a tuple

(Similarly for functools.wraps.)

The problem is that update_wrapper includes __type_params__ by default (which is undocumented, see related issue) and type.__type_params__ is a descriptor.

CPython versions tested on:

3.12

Operating systems tested on:

Linux

Linked PRs

• gh-119011: type.__type_params__ now return an empty tuple #119296
• gh-119011: Return an empty tuple on type_get_type_params as special case for PyType_Type #119313
• [3.13] gh-119011: type.__type_params__ now return an empty tuple (GH-119296) #119678
• [3.12] gh-119011: type.__type_params__ now return an empty tuple (GH-119296) #119681