>>> from typing import Generic, TypeVar>>> T = TypeVar("T")>>> U = TypeVar("U")>>> class X(Generic[T], Generic[U]): pass... Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "/Users/jelle/py/cpython/Lib/typing.py", line 1088, in _generic_init_subclass    raise TypeError(TypeError: Cannot inherit from Generic[...] multiple types.