两个 3 行 3 列的矩阵，实现其对应位置的数据相加，并返回一个新矩阵

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]
 
Y = [[5,8,1],
    [6,7,3],
    [4,5,9]]
 
result = [[0,0,0],
         [0,0,0],
         [0,0,0]]
 
# 迭代输出行
for i in range(len(X)):
   # 迭代输出列
   for j in range(len(X[0])):
       result[i][j] = X[i][j] + Y[i][j]
 
for r in result:
   print(r)

执行以上代码，输出结果如下：

[17, 15, 4]
[10, 12, 9]
[11, 13, 18]