python装饰器

1.The most simple decorator

[in]

def login(func):
    print('a')
    return func
@login
def func1():
    print('my first function')

func1()

[out]

a
my first function

2.strengthen

[in]

def login(func):
    def inner():
        print('a')
        print('b')
        return func()
    return inner
@login
def func1():
    print('my first function')

func1()

[out]

a
b
my first function

*1.return is a function,not the result of function running*

2.renturn a new function