Creating lists of lists in a pythonic way

Question

I\'m using a list of lists to store a matrix in python. I tried to initialise a 2x3 Zero matrix as follows.

mat=[[0]*2]*3

However, when I chang

Answer 1

If the sizes involved are really only 2 and 3,

mat = [[0, 0], [0, 0], [0, 0]]

is easily best and hasn't been mentioned yet.