mypy
https://github.com/python/mypy
Python
Optional static typing for Python
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- Issues
- Disable comparison overlap checks in assert statements
- Opt-in error for `if x:` when `x: None | int` or `None | str` etc.
- Sketch implementation of "optional-non-truthy" check for `if x` with `x: None | str`
- Inconsistent "Incompatible return type" error when `List[int]` is returned for `List[Union[str, int]]` when layered up with Tuple/Union
- overload with wrong return type is ignored
- False negative when lvalue has union type
- Incorrect diagnostic on missing submodule
- Inconsistent behavior: MyPy rejects isinstance with Any, but accepts cast from Any for ignored imports
- False negative: potentially unbound instance attribute doesn't trigger `possibly-undefined` error
- dmypy in a metadata reload loop with `--use-fine-grained-cache`
- Docs
- Python not yet supported