Fast matrix transposition in Python

Question

Is there any fast method to make a transposition of a rectangular 2D matrix in Python (non-involving any library import).?

Say, if I have an array

Answer 1

If you're working with matrices, you should almost certainly be using numpy. This will perform numerical operations easier and more efficiently than pure Python code.

>>> x = [[1,2,3], [4,5,6]]
>>> x = numpy.array(x)
>>> x
array([[1, 2, 3],
       [4, 5, 6]])
>>> x.T
array([[1, 4],
       [2, 5],
       [3, 6]])

"non-involving any library import" is a silly, non-productive requirement.