mypy
https://github.com/python/mypy
Python
Optional static typing for Python
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- Issues
- Regression: mypy thinks line is unreachable in 0.780 upwards, while (correctly) not showing a warning in 0.770 and below
- Support disallow_untyped_decorators = false option for 3rd party libraries
- __add__ and __iadd__ are incompatible for list
- Incorrect constraint inference for unions with nested generics
- mypy doesn't understand dict contstruction
- @property returning descriptor instance triggers false positive
- (🎁) Flag to make default return type `None` instead of `Any`
- Type fails to get "refined" on branch when `is None`-check happens in variable assignment
- __r<magic>__ methods for reflected (swapped) operands doesnt duck type int to float
- Unknown `DefaultNamedArg` raises type incompatibility errors
- Docs
- Python not yet supported