def _update_state(self, change):
        """ Keep position and direction in sync with axis """
        self._block_updates = True
        try:
            self.position = self.axis.Location()
            self.direction = self.axis.Direction()
        finally:
            self._block_updates = False
def _update_state ( self , change ) : self . _block_updates = True try : self . position = self . axis . Location ( ) self . direction = self . axis . Direction ( ) finally : self . _block_updates = False
Keep position and direction in sync with axis