matrix transpose

🏠
1m = [[1, 2, 3],
2   [4, 5, 6],
3   [7, 8, 9]]
4
5[*zip(*m)]

Output:

1[(1, 4, 7),
2(2, 5, 8),
3(3, 6, 9)]

See also:

matrix clockwise rotation

matrix anticlockwise rotation