If you need an explicit self hint for the class that refers to whatever class is in context, and you’re using Python 3.11 or later, you can import Self from the typing module and use that as a hint.

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.

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 ...

The most-wanted features by Python developers are static typing and strict type hinting, closely followed by performance improvements, Python Software Foundation survey results reveal.