#test
class Screen(object) : 
    @property
    def width(self) : 
        return self._width;
    
    @width.setter
    def width(self , value) : 
        self._width = value;
    
    @property
    def height(self) : 
        return self._height;
    
    @height.setter
    def height(self , value) : 
        self._height = value;
    
    @property
    def resolution(self) : 
        return 786432;

s = Screen();
s.width = 3000;
s.height = 2000;
print('resolution =', s.resolution)
if s.resolution == 786432 : 
    print('测试通过!')
else : 
    print('测试失败!')