mypy
https://github.com/python/mypy
Python
Optional static typing for Python
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- Issues
- Tests won't run on Windows. FileNotFoundError: [WinError 2] The system cannot find the file specified.
- Lazily process installed packages
- mypy is slow when type checking torch
- False positive list comprehension for union type source iterable
- no error on `TypeVar` with explicitly declared variance when the generic is used in another type with a different variance
- no error when `TypeVar` with explicit variance is used in the wrong position when it's part of a union
- Issues with popular third-party packages (meta)
- itertools.chain returns object when using iterators of different types
- mypy tries to infer the type parameters of a generic class even if they are explicitly given
- Declaration-order-dependent possibly-undefined false positive with nested ifs/matches, decorated any functions and NoReturn
- Docs
- Python not yet supported