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~~~~ class Screen(object): @property #读取属性 def width(self): return self.width @width.setter #设置属性 def width(self,value): if not isinstance(value,int): raise ValueError('宽度必须为整型') elif value<0: raise ValueError('宽度不能小于0') else: self.width = value @property def height(self): return self.height @height.setter def height(self,value): if not isinstance(value,int): raise ValueError("必须为整型") elif value<0: raise ValueError('不能小于0') else: self.height = value @property def resolution(self): return self.width*self.height


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