Add LLs Gist

"""Add Linked Lists of Numbers."""

def add_lists(list1, list2):
  """Function to create new LL based off sums of both other LLs."""
  added_link = LinkedList()
  temp = []
  leftover = 0
  while list1.head is not None and list2.head is not None:
    if list1.head:
      val_1 = list1.pop()
    else:
      val_1 = 0
    if list2.head:
      val_2 = list2.pop()
    else:
      val_2 = 0
    sum = val_1 + val_2 + int(leftover)
    if sum < 10:
      temp.append(sum)
      leftover = str(0)
    else:
      leftover = str(sum)[:-1]
      temp.append(str(sum)[0])
  for i in temp.reverse():
    added_link.push(temp[i])