I have three lists
l1 = ['a', 'b', 'c']
l2 = ['1', '2', '3', '4']
l3 = ['z', 'l', 'd', 't', 'm']
I want to combine them to create
lc = [['a', '1', 'z'], ['b', '2', 'l'], ['c', '3', 'd'],
[' ', '4', 't'], [' ', ' ', 'm']]
this question shows the roundrobin iter, but it just fills and doesn't do the blanks. I don't understand how to modify the iter to instead of removing the exhausted list but to keep on adding blanks