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

I use

mat = [[0 for col in range(3)] for row in range(2)]

although depending on what you do with the matrix after you create it, you might take a look at using a NumPy array.