code: def clear(self):
          'od.clear() -> None.  Remove all items from od.'
          root = self.__root
          root[:] = [root, root, None]
          self.__map.clear()
          dict.clear(selff clear(self):
          'od.clear() -> None.  Remove all items from od.'
          root = self.__root
          root[:] = [root, root, None]
          self.__map.clear()
          dict.clear(self)
docs: od.clear() -> None.  Remove all items from od.