def _ListFromConcat(*items):
  """Generate list by concatenating inputs (note: only concatenates lists, not
  tuples or other iterables)."""
  itemsout = []
  for item in items:
    if item is None:
      continue
    if type(item) is not type([]):
      itemsout.append(item)
    else:
      itemsout.extend(item)
  return itemsout