Transpose list of lists

Question

Let\'s take:

l = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

The result I\'m looking for is

r = [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
         


        

Answer 1

Maybe not the most elegant solution, but here's a solution using nested while loops:

def transpose(lst):
    newlist = []
    i = 0
    while i < len(lst):
        j = 0
        colvec = []
        while j < len(lst):
            colvec.append(lst[j][i])
            j = j + 1
        newlist.append(colvec)
        i = i + 1
    return newlist