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