code: def clear(self, actors=()):
          
          if not utils.isSequence(actors):
              actors = [actors]
          if len(actors):
              for a in actors:
                  self.removeActor(a)
          else:
              for a in settings.collectable_actors:
                  self.removeActor(a)
              settings.collectable_actors = []
              self.actors = []
              for a in self.getActors():
                  self.renderer.RemoveActor(a)
              for a in self.getVolumes():
                  self.renderer.RemoveVolume(a)
              for s in self.sliders:
                  s.EnabledOff()
              for b in self.buttons:
                  self.renderer.RemoveActor(b)
              for w in self.widgets:
                  w.EnabledOff()
              for c in self.scalarbars:
                  self.renderer.RemoveActor(c)
docs: Delete specified list of actors, by default delete all.