What is the type hint for a class reference?

Question

I am looking at PEP 484 and cannot find a description of how to type hint a class reference. Are class references declared as Callables as shown below?

from typing import Callable

class SomeClass:
    def __init__(self):
        self.s = 'Hello'

    def display(self):
        print(self.s)

x: Callable[[], SomeClass] = SomeClass

instance = x()
instance.display()

Answer 1

If you only care that x is a class, you would just use type (or some other appropriate metaclass).

x: type = SomeClass

If x should be SomeClass or one of its descendants, use typing.Type

x: typing.Type[SomeClass] = SomeClass

If x has to be exactly SomeClass (for whatever reason), I think typing.TypeVar is the appropriate choice.

x: typing.TypeVar('SomeClass', SomeClass) = SomeClass