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慢慢来

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嬉皮小丸子

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class Screen(object): @property def width(self): return self._width @width.setter def width(self,value): if not isinstance(value,(int,float)): raise ValueError('width must be an integer or float') if value<0: raise ValueError('width must greater than 0!') self._width=value

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

@height.setter
def height(self,value):
    if not isinstance(value,(int,float)):
        raise ValueError('height must be an integer or float')
    if value < 0:
        raise ValueError('height must greater than 0!')
    self._height=value

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

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!')

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