How to append a list to an existing list of lists?

Question

If I have a list of lists [[1,1,1,1],[2,2,2,2]] how do I add a 3rd list [3,3,3,3] to it to make it [[1,1,1,1],[2,2,2,2],[3,3,3,3]]

Answer 1

You can simply use .append() to append the new list to the existing list of lists.

L = [[1,1,1,1], [2,2,2,2]]
L.append([3,3,3,3])

# L = [[1,1,1,1],[2,2,2,2],[3,3,3,3]]