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1.9 Regression: __hash__ method in attrs class is ignored #17015
Description
Bug Report
mypy is ignoring a manually-written __hash__ method in an attrs class.
Bisect points to 91be285 causing the regression. cc @Tinche
Possibly reported already in a comment here? #16556 (comment)
To Reproduce
import attrs
from typing import reveal_type
@attrs.define()
class A():
name: str = attrs.field()
def __hash__(self) -> int:
return hash(self.name)
reveal_type(A.__hash__)Expected Behavior
$ py -m mypy --strict foo.py # 1.8
foo.py:10: note: Revealed type is "def (self: foo.A) -> builtins.int"
$ py foo.py
Runtime type is 'function'Actual Behavior
$ py -m mypy --strict foo.py # 1.9
foo.py:10: note: Revealed type is "None"
$ py foo.py
Runtime type is 'function'Your Environment
- Mypy version used: 1.9.0
- Mypy command-line flags: n/a
- Python version used: 3.12
- attrs version: 23.2.0
Activity
Tinche commented on Mar 11, 2024
I'll take this.
Fix attrs hashability detection
Fix attrs hashability detection
attrs: Fix emulating hash method logic
attrs: Fix emulating hash method logic
attrs: Fix emulating hash method logic
attrs: Fix emulating hash method logic
attrs: Fix emulating hash method logic (#17016)