38.Python：叠加多个装饰器的分析

# 叠加多个装饰器的加载、分析

def deco1(func1):
    def wrapper1(*args, **kwargs):
        print("print1")
        res1 = func1(*args, **kwargs)
        return res1
    return wrapper1


def deco2(func2):
    def wrapper2(*args, **kwargs):
        print("print2")
        res2 = func2(*args, **kwargs)
        return res2
    return wrapper2


def deco3(a):
    def outter3(func3):
        def wrapper3(*args, **kwargs):
            print("print3", a)
            res3 = func3(*args, **kwargs)
            return res3
        return wrapper3
    return outter3


# 加载顺序自下而上
# 执行顺序自上而下
@deco1              # index=deco1(deco2，wrapper的内存地址)
@deco2              # deco2.wrapper的内存地址=deco2(deco3.wrapper的内存地址)
@deco3(111)         # deco3.wrapper的内存地址=deco3(index)
def index(x, y):
    print('from index %s %s' % (x, y))


index(1, 2)