[Python] How do I get the type that was passed into a generic class's constructor? [duplicate]

Consider this:

from typing import Generic, Optional, TypeVar, cast

T = TypeVar("T")

class Test(Generic[T]):
name: str
value: Optional[T] = None

def __init__(
self,
name: str,
value: Optional[T] = None,
):
self.name = name
self.value = value

test_int = Test[int](name="test")
test_str = Test[str](name="test")


What property do I use to see that test_int was instantiated as int and test_str was instantiated as str? I cannot figure out how to get this information.

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