在Python类中订购方法的好方法是什么？

class Order:
    def __init__(self, item, quantity):
        self._item = item
        self._quantity = quantity

    @property
    def item(self):
        return self._item

    @item.setter
    def item(self, new_item):
        if not isinstance(new_item, str):
            raise TypeError("item must be a string")
        self._item = new_item

    @property
    def quantity(self):
        return self._quantity

    @quantity.setter
    def quantity(self, new_quantity):
        if not isinstance(new_quantity, int):
            raise TypeError("quantity must be an integer")
        self._quantity = new_quantity

order = Order("coffee", 3)
print(order.item)  # 输出 "coffee"
print(order.quantity)  # 输出 3
order.item = "tea"
order.quantity = 5
print(order.item)  # 输出 "tea"
print(order.quantity)  # 输出 5