Python 3 introduced the idea of "type annotations," and as of Python 3.6, you can annotate variables, not just function parameters and return values. The idea is that you can put a colon (:) and then ...

Mypy, Pytype, Pyright, and Pyre can help you keep your type-hinted Python code bug-free. Let’s see what each of these useful tools has to offer.

Learn how to use Python’s optional type-hinting syntax to create cleaner and more useful code.

A new open source VS Code extension called pyright has been created as a Microsoft 'side project' to improve on current offerings for static type checking for the Python programming language.