老男孩Python运维自动化课程之－－装饰器

def w1(main_func):
    def outer(*args, **kwargs):
        before_func(*args, **kwargs) ＃before_func定义忽略

        main_func(*args, **kwargs)

        after_func(*args, **kwargs)  ＃after_func定义忽略
    return outer

@w1
def show()
    pass
# 装饰器w1将show作为其第一个参数，并使用返回值重新定义了show

def login(name, password)...

def errorHandler()...

def Filter(before_func, after_func):
    def outer(main_func):
        def wrapper(*args, **kwargs):
            before_result = before_func(*args, **kwargs)
            main_result = main_func(*args, **kwargs)
            after_result = after_func(*args, **kwargs)
    return wrapper
return outer

@Filter(login, errorHandler)
def show():
    pass

#先运行一次Filter(login, errorHandler)，用返回值替换自身。然后再运行outer(main_func)