How to make all lists in a list of lists the same length by adding to them

Question

I have a nested list which contains lists filled with strings. What I am trying to do is make each list in this nest the same length as the longest available list in that n

Answer 1

You can do this,

maxLen = max(map(len, arr))
[row.extend(['null']*(maxLen - len(row))) for row in arr]