我想在item类中添加item类

class Item:
    def __init__(self, name, price, description, quantity):
        self.name = name
        self.price = price
        self.description = description
        self.quantity = quantity
        self.items = []

    def add_item(self, item):
        self.items.append(item)

    def get_total_price(self):
        total_price = self.price * self.quantity
        for item in self.items:
            total_price += item.price * item.quantity
        return total_price

    # 其他方法...

# 示例用法
item1 = Item("Item 1", 10, "Description 1", 2)
item2 = Item("Item 2", 20, "Description 2", 3)

item1.add_item(item2)

print(item1.get_total_price())  # 输出：110