从多个类获取值

class Product:
    def __init__(self, id, name, price):
        self.id = id
        self.name = name
        self.price = price

class Order:
    def __init__(self):
        self.products = []

    def add_product(self, product):
        self.products.append(product)

    def get_total_price(self):
        return sum(product.price for product in self.products)

class Customer:
    def __init__(self, id, name):
        self.id = id
        self.name = name
        self.orders = []

    def add_order(self, order):
        self.orders.append(order)

    def get_total_spent(self):
        return sum(order.get_total_price() for order in self.orders)

# 示例使用
product1 = Product(1, "Laptop", 1000)
product2 = Product(2, "Smartphone", 500)

order1 = Order()
order1.add_product(product1)
order1.add_product(product2)

customer1 = Customer(1, "Alice")
customer1.add_order(order1)

print(f"{customer1.name} has spent a total of ${customer1.get_total_spent()}")