Python’s type hinting is specifically designed for this use case: https://docs.python.org/3/library/typing.html https://docs.python.org/3/library/typing.html A

Python’s type hinting is specifically designed for this use case: https://docs.python.org/3/library/typing.html https://docs.python.org/3/library/typing.html Also, TypeScript is designed to work the same way, as it can coexist with untyped JavaScript code as you introduce it to the code base (it still has to run through a compiler, of course).