mypy
https://github.com/python/mypy
Python
Optional static typing for Python
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- Issues
- (🐞) Inconsistent reachability depending if module level or not
- Decorator confused by keyword-only parameter with Union, erroneously expects `<nothing>`, but only in some cases?
- instance check with generic `type` causes narrowing to `<nothing>`
- Unexpected "incompatible type" error when chaining bytes(filter())
- Use union instead of join for unifying types
- Don't require annotations of kwargs initialized to bool, float, int or string constants
- (🐞) Strings as `TypeAlias`s are incorrectly assumed to be `type`s
- (🎁) Special case `NoReturn`, `Never`, `Self` and `TypeAlias` to not be subscriptable
- (🐞) An error should be reported when `reveal_type` is used but not called
- isinstance wrongly narrows away Any
- Docs
- Python not yet supported