Multiple decorators decorate a function

# !/usr/bin/env python
# -*- coding:utf-8 -*-

def wrapper1(func1):  # func1 == func Primitive function 
    def inner1(*args, **kwargs):
        print('wrapper1, before func')
        ret1 = func1(*args, **kwargs)
        print('wrapper1, after func')
        return ret1
    return inner1


def wrapper2(func2):  # func2 = inner1
    def inner2(*args, **kwargs):
        print('wrapper2, before func')
        ret2 = func2(*args, **kwargs)
        print('wrapper2, after func')
        return ret2
    return inner2


@wrapper2     #  The second step ： func = wrapper2(func),  Before executing the decorator, follow the first step func==inner1,  Actuator finisher wrapper2 after ,func2==inner1, Sinister func==inner2
@wrapper1     #  First step ： func = wrapper1(func),  Actuator finisher wrapper1, be func1 == func,  Sinister  func==inner1
def func():
    print("Hello World!")


func()    #  The third step ： func() == inner2() , Then execute the functions in turn according to the call  , ( According to the second step ：func==inner2)

The execution sequence is shown in the figure ：