code: def transition(self, duration, brightness=None, temperature=None):
          
          # Transition immediately if duration is zero.
          if duration == 0:
              if brightness is not None:
                  self.brightness = brightness
              if temperature is not None:
                  self.temperature = temperature
              return
          if brightness != self.brightness or temperature != self.temperature:
              self._transition(duration, brightness, temperature)
docs: Transition wrapper.
  
          Short-circuit transition if necessary.
  
          :param duration: Duration of transition.
          :param brightness: Transition to this brightness.
          :param temperature: Transition to this temperature.