#Screen class Screen(object):

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

@width.setter
def width(self, value):
    if not isinstance(value, int):
        raise ValueError('score must be an integer!')
    if value < 0:
        raise ValueError('score must over zero')
    self._width = value

@property
def height(self):
    return self_height

@height.setter
def height(self, value):
    if not isinstance(value, int):
        raise ValueError('score must be an integer!')
    if value < 0:
        raise ValueError('score must over zero')
    self._heigh = value

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

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!')