Python 中的装饰器 Getter 和 Setter

class shoe:    def __init__(self, brand = "adidas", size = 9):        self.brand = brand        self.size = size        self._condition = "new"    @property    def size(self):        """the size property"""        return self._size    @size.setter    def size(self, size):        """size must be an integer"""        if isinstance(size, int):            self._size = size        else:            print("size must be an integer")    def cobble(self):        """repairs the shoe and sets the condition to 'new'."""        self.condition = "new"        print("your shoe is as good as new!")    @property    def condition(self):        """the condition property"""        return self._condition    @condition.setter    def condition(self, condition):        self._condition = condition

 @size.setter    def size(self, size):        """size must be an integer and can't be changed once set"""        if hasattr(self, '_size'):            raise AttributeError("Can't change size once set")        if isinstance(size, int):            self._size = size        else:            raise ValueError("size must be an integer")