With Python 3.5, type hints officially became part of the language (PEP 484). Using a linter or code-checking tool, developers can check the consistency of variables and their types across a ...

Mypy, Pytype, Pyright, and Pyre can help you keep your type-hinted Python code bug-free ... of PEP 484 stub files when you want to use type hints for a module’s public interfaces.