装饰器1

def lo_stat(msg=None):
    print(f"{msg} 启动")


def lo_end(msg=None):
    print(f"{msg} 结束")


def decorator(func):
    def wrapper():
        # print("在函数执行之前做点事")
        lo_stat(func.__name__)
        func()  # 调用被装饰的函数
        lo_end(func.__name__)
        # print("在函数执行之后做点事")

    return wrapper


@decorator
def hello():
    print("hello world")



def log(func):
    def wrapper(*args, **kwargs):
        print(f"调用 {func.__name__} 函数")
        return func(*args, **kwargs)
    return wrapper

@log
def add(a, b):
    return a + b







if __name__ == '__main__':
    hello()
    print(add(10, 20))