标准兼容测试首购优惠

def validate_first_purchase_discount(user_id, product_id):
    # 检查用户是否已经享受过首购优惠
    if is_user_eligible_for_first_purchase_discount(user_id):
        apply_discount(product_id, discount_rate=0.1)  # 应用10%的折扣
        mark_discount_as_used(user_id)  # 标记该用户已使用过优惠
        return True
    else:
        return False

def is_user_eligible_for_first_purchase_discount(user_id):
    # 查询数据库确认用户是否首次购买
    user_purchase_history = get_user_purchase_history(user_id)
    return len(user_purchase_history) == 0

def apply_discount(product_id, discount_rate):
    # 更新产品价格应用折扣
    product_price = get_product_price(product_id)
    discounted_price = product_price * (1 - discount_rate)
    update_product_price(product_id, discounted_price)

# 假设的辅助函数
def get_user_purchase_history(user_id):
    # 从数据库获取用户的购买历史
    pass

def get_product_price(product_id):
    # 获取产品的原始价格
    pass

def update_product_price(product_id, new_price):
    # 更新产品的价格
    pass