python 笔记 装饰器

def w1(func):
    def inner():
        print ("w1,before")
        func()
        print("w1,after")
    return inner

def w2(func):
    def inner():
        print ("w2,before")
        func()
        print("w2,after")
    return inner
@w2
@w1
def foo():
    print ("foo")

foo()

一个函数可以被多次装饰，从上往下执行，盒子是外套装饰器。

C:\Users\pcdog\AppData\Local\Programs\Python\Python35\python.exe C:/Users/pcdog/PycharmProjects/untitled/zhuangshiqi.py

w2,before

w1,before

foo

w1,after

w2,after

Process finished with exit code 0