@classmethod
  @gen.coroutine
  def QueryWithFollower(cls, client, user_id, viewpoint_id):
    viewpoint, follower = yield [gen.Task(Viewpoint.Query, client, viewpoint_id, None, must_exist=False),
                                 gen.Task(Follower.Query, client, user_id, viewpoint_id, None, must_exist=False)]
    assert viewpoint is not None or follower is None, (viewpoint, follower)
    raise gen.Return((viewpoint, follower))
Initialize the sensor.
dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/viewpoint.py/Viewpoint.QueryWithFollower--crossover with--dataset/ETHPy150Open home-assistant/home-assistant/homeassistant/components/sensor/command_line.py/CommandSensor.__init__