python generics code example

Example 1: python template generics

from typing import TypeVar, Generic

T = TypeVar('T')

class Stack(Generic[T]):
    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

Example 2: python type constraint

# Example of typing constraint in python (From 3.5)
def greeting(name: str) -> str:
    return 'Hello ' + name