﻿ Python: Print a given N by M matrix of numbers line by line in forward > backwards > forward >... order - w3resource

# Python: Print a given N by M matrix of numbers line by line in forward > backwards > forward >... order

## Python Basic - 1: Exercise-78 with Solution

Write a Python program to print a given N by M matrix of numbers line by line in forward > backwards > forward >... order.

Input matrix:
[[1, 2, 3, 4],
[5, 6, 7, 8],
[0, 6, 2, 8],
[2, 3, 0, 2]]
Output:
1
2
3
4
8
7
6
5
0
6
2
8
2
0
3
2

Sample Solution:

Python Code:

``````def print_matrix(nums):
flag = True

for line in nums:

if flag == True:
i = 0
while i < len(line):
print(line[i])
i += 1
flag = False

else:
i = -1
while i > -1 * len(line) - 1:
print(line[i])
i = i - 1
flag = True
print_matrix([[1, 2, 3, 4],
[5, 6, 7, 8],
[0, 6, 2, 8],
[2, 3, 0, 2]])

``````

Sample Output:

```1
2
3
4
8
7
6
5
0
6
2
8
2
0
3
2
```

Flowchart: Python Code Editor:

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