TypeVar is a generic type variable that allows you to create a placeholder for a type. It is typically used when you want to define a generic function or class that can operate on different types without specifying them explicitly. It allows you to introduce a type variable that can be used as a type annotation for function arguments, return values, or class attributes.
Here's an example of how TypeVar can be used:
from typing import List, TypeVar
T = TypeVar('T')
def reverse_list(items: List[T]) -> List[T]: