code: def set(self, timestamp, status, value):
          
          reading = self._current_reading = Reading(timestamp, status, value)
          self.notify(reading)
docs: Set the current value of the sensor.
  
          Parameters
          ----------
          timestamp : float in seconds
             The time at which the sensor value was determined.
          status : Sensor status constant
              Whether the value represents an error condition or not.
          value : object
              The value of the sensor (the type should be appropriate to the
              sensor's type).