Comments (1)
erictraut
commented on June 3, 2024
2
This is intended behavior. According to the typeshed stubs, NotImplemented is an instance of the class _NotImplementedType which is a special class that derives from Any. In general, classes that drive from Any must be considered compatible with all other classes unless those classes are final. The NoneType class is final, so it cannot possibly be compatible with _NotImplementedType. In practice, it's problematic to apply this rule to all final classes, but it is important for a variety of other reasons for the rule to apply to None in particular. A bunch of other common use cases break without this special case.
FWIW, mypy also applies this special case, and its behavior matches pyright's for the code in your example.
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Related Issues (20)
- StrEnum `value` property type regression HOT 2
- `def __init__(self: Self)` causes `reportInvalidTypeVarUse` HOT 1
- reportOverlappingOverload false positive: variadic tuple unpacking HOT 2
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- Introduce `reportUnnecessaryTypeIs` rule HOT 3
- Support different type for class variable and instance variable HOT 3
- Different inferred type `t = tuple(); list(t)` and `list(tuple())` HOT 1
- Type hinting for tuples HOT 4
- `str` is considered incompatible with `Annotated[str]` HOT 1
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- Overloaded decorators break type inference for self-referential methods HOT 3
- Changed TypeIs behavior in 1.1.361 to 1.1.364 HOT 2
- Feature Request: Insert all arguments of a function HOT 1
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