python 多层装饰器加载和执行顺序

加载顺序(outter函数的调用顺序):自下而上

执行顺序(wrapper函数的执行顺序):自上而下

code

def outter1(func1):  # func1=wrapper2的内存地址
    print('加载了outter1')

    def wrapper1(*args, **kwargs):
        print('执行了wrapper1')
        res1 = func1(*args, **kwargs)
        return res1

    return wrapper1


def outter2(func2):  # func2=wrapper3的内存地址
    print('加载了outter2')

    def wrapper2(*args, **kwargs):
        print('执行了wrapper2')
        res2 = func2(*args, **kwargs)
        return res2

    return wrapper2


def outter3(func3):  # func3=最原始的那个index的内存地址
    print('加载了outter3')

    def wrapper3(*args, **kwargs):
        print('执行了wrapper3')
        res3 = func3(*args, **kwargs)
        return res3

    return wrapper3


@outter1  # outter1(wrapper2的内存地址)======>index=wrapper1的内存地址
@outter2  # outter2(wrapper3的内存地址)======>wrapper2的内存地址
@outter3  # outter3(最原始的那个index的内存地址)===>wrapper3的内存地址
def index():
    print('from index')


print('======================================================')
index()

执行结果：

加载了outter3
加载了outter2
加载了outter1
======================================================
执行了wrapper1
执行了wrapper2
执行了wrapper3
from index