9.两个 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

X = [[12,7,3],

    [4 ,5,6],

    [7 ,8,9]]

 

Y = [[5,8,1],

    [6,7,3],

    [4,5,9]]

 

#encoding=utf-8

z=[

[0,0,0],

[0,0,0],

[0,0,0]

]

 

x = [[12,7,3],

    [4 ,5,6],

    [7 ,8,9]]

 

y = [[5,8,1],

    [6,7,3],

    [4,5,9]]

for i in range(len(x)):

    for j in range(len(x[0])):

        z[i][j]=x[i][j]+y[i][j]

 

print z

 

[[x[i][j]+y[i][j] for j in range(len(x[0]))] for i in range(len(x))]