code: def add_effect(self, effect, reset=True):
          
          # Reset the effect in case this is in the middle of a Scene.
          if reset:
              effect.reset()
          effect.register_scene(self)
          self._effects.append(effect)
docs: Add an effect to the Scene.
  
          This method can be called at any time - even when playing the Scene.  The default logic
          assumes that the Effect needs to be reset before being displayed.  This can be overridden
          using the `reset` parameter.
  
          :param effect: The Effect to be added.
          :param reset: Whether to reset the Effect that has just been added.