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Description
When trying to define an enum of an @attrs.define class, Mypy gives typing errors, but it works in runtime.
When trying to define an enum of an @attrs.frozen class, Mypy doesn't give an error, but it errors at runtime.
When trying to define an enum of a @dataclasses.dataclass class, Mypy doesn't give an error, and it works at runtime.
I started noticing this today after I removed support for Python 3.9 from my project, and ran poetry update.
from dataclasses import dataclass
from enum import Enum
import attrs
from pytest import raises
@attrs.define
class AttrsDefine:
a: int
b: float
# error: Definition of "__hash__" in base class "AttrsDefine" is incompatible with definition in base class "Enum" [misc]
class AttrsDefineEnum(AttrsDefine, Enum):
X = (1, 2.0)
Y = (3, 4.0)
@attrs.frozen
class AttrsFrozen:
a: int
b: float
@dataclass
class Dataclass:
a: int
b: float
class DataclassEnum(Dataclass, Enum):
X = (1, 2.0)
Y = (3, 4.0)
def test_enums() -> None:
with raises(attrs.exceptions.FrozenInstanceError) as exc_info:
# attr.exceptions.FrozenInstanceError
class AttrsFrozenEnum(AttrsFrozen, Enum):
X = (1, 2.0)
Y = (3, 4.0)
print(repr(AttrsFrozenEnum.X))
print(exc_info.exconly())
print(repr(AttrsDefineEnum.X))
print(repr(DataclassEnum.X))❯ mypy attrenum.py
attrenum.py:15: error: Definition of "__hash__" in base class "AttrsDefine" is incompatible with definition in base class "Enum" [misc]
Found 1 error in 1 file (checked 1 source file)
❯ pytest -s attrenum.py
=================================================================================== test session starts ===================================================================================
platform linux -- Python 3.11.6, pytest-7.4.0, pluggy-1.2.0
rootdir: /home/micael/projects/playground
collected 1 item
attrenum.py attr.exceptions.FrozenInstanceError
AttrsDefineEnum(a=1, b=2.0)
<DataclassEnum.X: Dataclass(a=1, b=2.0)>
.
==================================================================================== 1 passed in 0.01s ====================================================================================❯ python --version
Python 3.11.4
❯ mypy --version
mypy 1.10.0 (compiled: yes)
❯ pip freeze
attrs==23.2.0
iniconfig==2.0.0
mypy==1.10.0
mypy-extensions==1.0.0
packaging==24.0
pluggy==1.5.0
pytest==8.2.1
typing_extensions==4.11.0