@property的应用

请利用@property给一个Screen对象加上width和height属性，以及一个只读属性resolution：

class Screen(object):
    @property
    def width(self):
        return self._width
    @width.setter
    def width(self,value):
        self._width=value
    @property
    def high(self):
        return self._high
    @high.setter
    def high(self,value):
        self._high=value
    @property
    def resolution(self):
        return self._high * self._width
        
s = Screen()
s.width = 1024
s.high = 768
print('resolution =', s.resolution)
if s.resolution == 786432:
    print('测试通过!')
else:
    print('测试失败!')