class Screen(object): @property def width(self): return self._width @width.setter #值的筛选 def width(self,value): if type(value) != int and type(value) != float: raise ValueError("str") if value<=0: raise ValueError("非有效数") self._width = value @property def height(self): return self._width @height.setter def height(self,value): if type(value) != int and type(value) != float: raise ValueError("str") if value<=0: raise ValueError("非有效数") self._height = value @property def resolution(self): return self._height * self._width
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