2018-10-29

#功能函数
def add(x,y):
    return x+y

#装饰函数
def logger(fn):
    print('frist')
    x = fn(4,5)
    print('second')
    return x 

print(logger(add))

#把函数add传给logger  ，return x+y
#print('frist')
#print('secend')
#  x = fn(4,5)  ==> x = 4 y= 5  x= 4+5 = 9 
#return 9 
frist
second
9