def finalize(self, ctx, shard_state):
    """Finalize writer shard-level state.

    Args:
      ctx: an instance of context.Context.
      shard_state: shard state.
    """
    raise NotImplementedError("finalize() not implemented in %s" -
                              self.__class__)
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/output_writers.py/OutputWriter.finalize/operator `%` -> `-`