class Screen(

    @property
    def width(self):
        return self._width

    @width.setter
    def width(self,width):
        self._width = width

    @property
    def height(self):
        return self._height

    @height.setter
    def height(self,height):
        self._height = height

    @property
    def resolution(self):
        return str(self._width) + ' * ' + str(self._height)

s = Screen()
s.width = 1366
s.height = 768
print(s.resolution)

运行结果

1366 * 768
[Finished in 0.2s]