What's the correct way to check if an object is a typing.Generic?

Question

I\'m trying to write code that validates type hints, and in order to do so I have to find out what kind of object the annotation is. For example, consider this snippet that\

Answer 1

The most you could do, I think, is to use your typ on a variable, use typing.get_type_hints on it and extract the info you need from the returned __annotations__-like dictionary.

PEP-484 says:

get_type_hints(), a utility function to retrieve the type hints from a function or method. Given a function or method object, it returns a dict with the same format as __annotations__, but evaluating forward references (which are given as string literals) as expressions in the context of the original function or method definition.

26.1.7. Classes, functions, and decorators says:

At runtime, isinstance(x, T) will raise TypeError. In general, isinstance() and issubclass() should not be used with types.

However, PEP-526 says in 'Non-goals':

While the proposal is accompanied by an extension of the typing.get_type_hints standard library function for runtime retrieval of annotations, variable annotations are not designed for runtime type checking. Third party packages will have to be developed to implement such functionality.