#代码： class Screen(object):

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

@width.setter
def width(self, value):
    if not isinstance(value, int):
        raise ValueError('width must be an integer!')
    self._width=value

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

@height.setter
def height(self, value):
    if not isinstance(value, int):
        raise ValueError('height must be an integer!')
    self._height=value

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

测试:

s = Screen() s.width = 1024 s.height = 768 print('resolution =', s.resolution) if s.resolution == 786432: print('测试通过!') else: print('测试失败!')

结果：

resolution = 786432 测试通过!