docs: def create_checksum_object_from_iterator(
      itr, algorithm=d1_common.const.DEFAULT_CHECKSUM_ALGORITHM
  ):
      """Calculate the checksum of an iterator.
  
      Args:
        itr: iterable
          Object which supports the iterator protocol.
  
        algorithm: str
          Checksum algorithm, ``MD5`` or ``SHA1`` / ``SHA-1``.
  
      Returns:
        Populated Checksum PyXB object.
  
      """
      checksum_str = calculate_checksum_on_iterator(itr, algorithm)
      checksum_pyxb = d1_common.types.dataoneTypes.checksum(checksum_str)
      checksum_pyxb.algorithm = algorithm
      return checksum_pyxb