[Python] Generic NamedTuple in python 3.7 [duplicate]

What is the correct way to define a Generic NamedTuple in using the typing module python 3.7?

I can define

from typing import TypeVar, Generic, NamedTuple

T = TypeVar("T")

class C(Generic[T], NamedTuple):
"""NameTuple and Generic ???"""
x: T

c = C(1)
print(c) # prints "C(x=1)", as expected



However, I cannot use the C[T] as a type hint:

# raises TypeError: 'type' object is not subscriptable
def f(c: C[int]):
print("from f:", c)

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