python 装饰器

# def play():
#     print("双击LOL")
#     print("选择狂战士")
#     print("进草丛")
#     print("崩山击","十字斩")

# def wrapper(fn):
#     def inner():
#         print("开挂")
#         fn()
#         print("关闭外挂")
#     return inner
#
# play = wrapper(play)
#
# play()

def wrapper(fn):
    def inner(*args, **kwargs): # 聚合
        """在目标函数之前的内容"""
        ret = fn(*arg, **kwargs) # 打散
        """在目标函数之后的内容"""
        return ret
    return inner
@wrapper
def func():
    pass
func()

def wrapper1(fn):
    def inner(*args, **kwargs):
        print("1")
        ret = fn(*args, **kwargs)
        print("2")
        return ret
    return inner

def wrapper2(fn):
    def inner(*args, **kwargs):
        print("3")
        ret = fn(*args, **kwargs)
        print("4")
        return ret
    return inner

def wrapper3(fn):
    def inner(*args, **kwargs):
        print("5")
        ret = fn(*args, **kwargs)
        print("6")
        return ret
    return inner
# 顺序 1 2 3  func 3 2 1
@wrapper1
@wrapper2
@wrapper3
def func():
    print("装饰器不难  滑稽脸)")
func()  # 1 3 5 装饰器不难  滑稽脸 6 4 2

def wrapper_out(参数):
        def wrapper(fn):
            def inner(*args, **kwargs): # 聚合
                """在目标函数之前的内容"""
                ret = fn(*arg, **kwargs) # 打散
                """在目标函数之后的内容"""
                return ret
            return inner
        return wrapper
@wrapper_out(实参)  # 执行的时候. 先执行函数的调用然后使用返回值和前面的@组合成装饰器语法糖
def func():
    pass