I'm trying to use type hints in my code but I simply don't understand how the concept applies to a Python descriptor. The only relevant info I could find on the matter was this 6+ year old post but I can't get my head around the solution. Is it not common practice to use type hints for Python descriptors? My descriptor is pretty basic: class D: def __init__(self, a: str): self._a = a def __get__(self, instance, owner) -> str: return self._a def __set__(self, instance, a: str): self._a = a Descriptor use: class A: d = D("Hi") def __init__(self): ... What would be the correct type hinting for instance and owner if all instances of class D will be created in class A? Do I need to create 3 __get__ methods with @overload in my descriptor (as in the linked post) to cover different use cases of the descriptor? And also, is importing TypeVar and/or Generic from typing necessary? I'm also wondering if classes D and A are properly defined if they need some sort of argument from TypeVar/Generic. Continue reading...
