帮我写一个商城二级分销实例

class User:
    def __init__(self, name):
        self.name = name
        self.referrals = []

    def add_referral(self, user):
        self.referrals.append(user)

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

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

    def register_user(self, name):
        user = User(name)
        self.users.append(user)
        return user

    def add_product(self, name, price):
        product = Product(name, price)
        self.products.append(product)
        return product

    def make_purchase(self, user, product):
        if product in self.products:
            referral_bonus = product.price * 0.1
            user.add_referral(referral_bonus)
            for referral in user.referrals:
                referral.add_referral(referral_bonus)
            print(f"{user.name} successfully purchased {product.name}")
        else:
            print("Product not found.")

# 示例用法
mall = ShoppingMall()

# 注册用户
user1 = mall.register_user("User1")
user2 = mall.register_user("User2")
user3 = mall.register_user("User3")

# 添加产品
product1 = mall.add_product("Product1", 100)
product2 = mall.add_product("Product2", 200)
product3 = mall.add_product("Product3", 300)

# 用户购买产品
mall.make_purchase(user1, product1)
mall.make_purchase(user2, product2)
mall.make_purchase(user3, product3)