Transpose a python matrix

Rotate the matrix in 90 degrees.

Input

((1, 2, 3, 4),
 (5, 6, 7, 8),
 (9, 10, 11, 12),
 (13, 14, 15, 16))

Output

((1, 5, 9, 13),
 (2, 6, 10, 14),
 (3, 7, 11, 15),
 (4, 8, 12, 16))