In this example, we will learn how to add two three-order matrices in Python.

### Source Code

```
#! /usr/bin/env python3
# -*- coding: utf-8 -*-
a=[[1,2,3],[3,2,1],[4,5,6]]
b=[[1,2,3],[3,2,1],[4,5,6]]
c=[[0,0,0],[0,0,0],[0,0,0]]
for i in range(0,len(a)):
for j in range(0,len(a[i])):
c[i][j] = a[i][j] + b[i][j]
print('The output of adding these two matrices is:')
print(c)
```

Output:

```
The output of adding these two matrices is:
[[2, 4, 6], [6, 4, 2], [8, 10, 12]]
```