class Movable(object):

    def moveLeft(self): raise NotImplementedError('Must implement Movable interface.')

    def moveRight(self): raise NotImplementedError('Must implement Movable interface.')

    def moveUp(self): raise NotImplementedError('Must implement Movable interface.')

    def moveDown(self): raise NotImplementedError('Must implement Movable interface.')

    def moveTo(self, coordinates): raise NotImplementedError('Must implement Movable interface.')