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任务

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林林1292

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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): raise ValueError('resolution is must be an integer') if value < 0: raise ValueError('resolution is less at 0') self._width = value @property def height(self): return self._height

@height.setter
def height(self,value):
    if not isinstance(value,int):
        raise ValueError('resolution is must be an integer')
    if value < 0:
        raise ValueError('resolution is less at 0')
    self._height = value

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

s = Screen() s.width = 1024 s.height = 768 print(s.resolution) assert s.resolution == 786432, '1024 * 768 = %d ?' % s.resolution

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