Previously, Python required using the typing module to provide tools for describing such types. As of Python 3.9, they can be done natively in Python: dict_of_users: dict ...

Given that, as shown above, functions are of type function, perhaps you can use that. But function isn't actually a recognized name in Python. Instead, you'll need to use the typing module, which ...

Speed improvements. Many individual performance improvements landed in Python 3.11, but the single biggest addition is the specializing adaptive interpreter.Since an object’s type rarely changes ...

One of the most popular answers is a system known as mypy, which takes advantage of Python 3's type annotations for its own purposes. ... I've grabbed Sequence from the typing module, which includes ...