python自定义注解

def print_log_before_action(fn):
    def print_log(*arg):
        print("before execute fn")
        return fn(*arg)

    return print_log


@print_log_before_action
def print_hello(name: str):
    print("hello python: " + name)


if __name__ == '__main__':
    # print("test")
    print_hello("guanxianseng")