Add __hash__ for a bunch of types that set it to None
#13286
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
radarhere
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Feb 5, 2025
| def conjugate(self) -> _ComplexLike: ... | ||
| @abstractmethod | ||
| def __eq__(self, other: object) -> bool: ... | ||
| __hash__: ClassVar[None] # type: ignore[assignment] |
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The Number class states that "Concrete numeric types must provide their own hash implementation"
Feel free to enlighten me if I've missed something, but doesn't the change here mean that you can't actually do that? So for example, doesn't this line mean that the following wouldn't work?
from numbers import Complex
class Test(Complex):
def __hash__(self) -> int:
return 0
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Good catch. I tested it, and this requires the use of # type: ignore[override] to type check with mypy correctly. That's not exactly wrong, but isn't a great experience either. I can see an argument for either way.
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I found these by removing
__hash__from stubtest's list of ignorable dunders._collections_abc.Mapping.__hash__and_collections_abc.Set.__hash__should also be here, but their counterparts intypingdo have a__hash__method, so I left that alone.Related to #2148
This unfortunately has little practical effect until python/mypy#4266 is fixed.