[Python] how to define python generic classes [duplicate]

I have a class:

T = TypeVar('T')


class Stack(Generic[T]):
def __init__(self) -> None:
self.items: list[T] = []

def push(self, item: T) -> None:
self.items.append(item)

def pop(self) -> T:
return self.items.pop()

def empty(self) -> bool:
return not self.items


but I can also do:

T = TypeVar('T')


class Stack:
def __init__(self) -> None:
# Create an empty list with items of type T
self.items: list[T] = []

def push(self, item: T) -> None:
self.items.append(item)

def pop(self) -> T:
return self.items.pop()

def empty(self) -> bool:
return not self.items

1. what is the difference between these two samples?
2. which on should I use?

I tried running both, and both worked.

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