@classmethod
  def init_job(cls, mapreduce_state):
    """Initialize job-level writer state.

    Args:
      mapreduce_state: an instance of model.MapreduceState describing current
      job. State can be modified during initialization.
    """
    raise NotImplementedError("init_job() not implemented in %s" + cls)
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/output_writers.py/OutputWriter.init_job/operator `%` -> `+`