combine.py

def iteratorAtomsDepleted(iteratorAtoms):
  return all(map(lambda iteratorAtom: iteratorAtom[1], iteratorAtoms))

def combine(*args):
  listIterators = [[iter(passedList), False]  for passedList in args]
  result = []
  while (not iteratorAtomsDepleted(listIterators)):
    for index, iteratorAtom in enumerate(listIterators):
      try:
        iterator, alreadyDone = iteratorAtom
        if alreadyDone:
          next
        result.append(iterator.next())
      except StopIteration:
        listIterators[index][1] = True
  return result