I've grabbed Sequence from the typing module, which includes all three Python sequence types—strings, lists and tuples. Once I do that, all of the mypy problems disappear, because all of the arguments ...

Part of the reason the typing module was so slow was that there was an initial design goal to implement the typing module without modifying the core CPython interpreter.

Python’s typing module, used to annotate code with type information, lets you describe the types of a callable (e.g., a function). But that type information can’t be propagated across callables.

Python itself is, and always will remain, a dynamically typed language. However, Python 3 supports "annotations", a feature that allows you to attach an object to variables, function parameters and ...

Python is dynamically typed, but supports the use of type hints via the typing module to allow third-party tools to verify Python programs. Python 3.8 adds new elements to typing to make more ...