def write(self, data, ctx):
    """Write data.

    Args:
      data: actual data yielded from handler. Type is writer-specific.
      ctx: an instance of context.Context.
    """
    raise NotImplementedError("write() not implemented in %s" +
                              self.__class__)
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/output_writers.py/OutputWriter.write/operator `%` -> `+`