Transpose list of lists

Question

I have the following code :

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]]
 

and not

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

Can anyone help me how to get that?

Answer 1

You can try the following and see if it works :

map(list, zip(*l))
--> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
 

For python 3.x users can use :

list(map(list, zip(*l)))