#code to print all atomic members of a list into a single list #eg convert [[1,2,3], [4,5,6], [7,8,9,10]] to l0 = [[1,2,3], [4,5,6], [7,8,9,10]] flat = [l2 for l1 in l0 for l2 in l1] #prints out: #[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]