闭包 和 装饰器

def deco(func):
    def inner():
        print("---")
        func()
    return inner

@deco
def show():
    print("AAA")

show()-------------------------
实现原理 show = deco(show)  show() 

def deco(func):
    def inner(num1, num2):   #不要忘了inner传进参数
        print("计算结果如下：")
        func(num1, num2)
    return inner

############## A ##################
@deco
def sum(num1, num2):
    result = num1 + num2
    print(result)

sum = deco(sum)

sum(1, 2)

############### B #################

def sum(num1, num2):
    result = num1 + num2
    print(result)

sum = demo(sum)

sum(1, 2)

A和B的效果是一样的