docs: def chunkiter(objs, n=100):
      """
      Chunk an iterator of unknown size. The optional
      keyword 'n' sets the chunk size (default 100).
      """
  
      objs = iter(objs)
      try:
          while (1):
              chunk = []
              while len(chunk) < n:
                  chunk.append(six.next(objs))
              yield chunk
      except StopIteration:
          pass
      if len(chunk):
          yield chunk