Unable to inspect class with cyfunction __init__ due to unwrap and descriptor behavior changed #137317
Description
Bug report
Bug description:
Background:
Pydantic v1 modified builtin dataclass's __init__ method (wraps). When inspect on the modified dataclass, the class's signature will contain a self parameter.
Reproduce code with pydantic v1 installed:
from dataclasses import dataclass
import inspect
from pydantic import BaseConfig
from pydantic.dataclasses import _add_pydantic_validation_attributes
@dataclass
class A:
x: int
print(inspect.signature(A).parameters) # x
_add_pydantic_validation_attributes(A, BaseConfig, False, "")
print(inspect.signature(A).parameters) # self, x
print(A.__init__, hasattr(A.__init__, "__wrapped__")) # cyfunction A.__init__, True
meth = inspect._descriptor_get(A.__init__, A)
print(meth, hasattr(A.__init__, "__wrapped__")) # bound method A.__init__, True
meth = inspect.unwrap(A.__init__, stop=lambda m: hasattr(m, "__signature__"))
print(meth) # function A.__init__, this cause the signature errorThis error is because of the unwrap and descriptor get behavior at
Lines 1924 to 1926 in fe0e921
The cyfunction __init__ descriptor return a bound method dataclass.__init__ and then unwrap it back to a function dataclass.__init__.
Related to #132055
CPython versions tested on:
3.13
Operating systems tested on:
Linux