@classmethod
  def from_json(cls, json):
    return cls(db_iters.RangeIteratorFactory.from_json(json["iter"]),
               json["instance_id"])
Create new DatastoreInputReader from json, encoded by to_json.
dataset/ETHPy150Open GoogleCloudPlatform/appengine-mapreduce/python/test/mapreduce/handlers_test.py/InputReader.from_json