python中map函数和reduce函数的使用方法介绍（附代码）

 def func(x):
     return x*x
 r=map(func,[1,2,3,4,5,6,7,8,9])
 l=list(r)
 print(l)

 [1, 4, 9, 16, 25, 36, 49, 64, 81]

from functools import reduce
def add(x,y):
    print('x is:',x,'y is:',y)
    return x+y
ret=reduce(add,[1,3,5,7,9])
print(ret)

x is: 1 y is: 3
x is: 4 y is: 5
x is: 9 y is: 7
x is: 16 y is: 9
25

from functools import reduce
def add(x,y):
    print('x is:',x,'y is:',y)
    return x*10+y
ret=reduce(add,[1,3,5,7,9])
print(ret)

 x is: 1 y is: 3
 x is: 13 y is: 5
 x is: 135 y is: 7
 x is: 1357 y is: 9
 13579