def to_json(self):
    """Returns an input shard state for the remaining inputs.

    Returns:
      A json-izable version of the remaining InputReader.
    """
    return {self.BLOB_KEY_PARAM: self._blob_key,
            self.START_INDEX_PARAM: self._start_index,
            self.END_INDEX_PARAM: self._end_index}
Returns an input shard state for the remaining inputs.

    Returns:
      A json-izable version of the remaining InputReader.
    
mapreduce/input_readers.py