Python 3 引入了函数注解.他们自己什么都不做，但您可以编写自己的执行:

Python 3 introduces function annotations. By themselves they don't do anything, but you can write your own enforcement:

def strict(fun):
    # inspect annotations and check types on call

@strict
def funcA(a: int, b: int) -> int:
    return a + b