Decorated functions do not work with inheritance

[LecrisUT]

I was trying to research how to get the class bound method instead of the function in a decorator and was looking at attrs if it figured it out, but apparently not

>>> import attrs

... @attrs.define
... class A:
...     foo: str = attrs.field()
... 
...     @foo.default
...     def _foo_default(self):
...         return "A"
... 
... @attrs.define
... class B(A):
...     def _foo_default(self):
...         return "B"
... print(A())
... print(B())
A(foo='A')
B(foo='A')  # was expecting `foo='B'` here due to overriding

Have you guys researched this topic and is there any conclusions on this?

[webknjaz]

$ python
Python 3.13.0 (main, Nov 18 2024, 05:02:35) [GCC 14.2.1 20241026] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import attrs
>>> @attrs.define
... class A:
...     foo: str = attrs.field()
...     
...     def _produce_overridable_default(self):
...         return 'A'
... 
...     @foo.default
...     def _foo_default(self):
...         return self._produce_overridable_default()
... 
>>> @attrs.define
... class B(A):
...     def _produce_overridable_default(self):
...         return 'B'
...
>>> print(A())
A(foo='A')
>>> print(B())
B(foo='B')

[LecrisUT]

Well sure, but was hoping for something with less boilerplate. I am reading https://sebastian-ahmed.medium.com/decorating-bound-methods-in-python-a-general-and-scalable-solution-b16579c3a469 because they claim that they can do it

[webknjaz]

Well, yeah.. I suppose using descriptors is the way, then.