旅游行业的 AI 助手需要理解用户的模糊需求(如“我想去个暖和的地方玩几天”),通过多轮对话逐步澄清偏好,并调用地图、酒店、天气等工具生成个性化行程。本文详解如何基于 HolySheep AI 实现完整的行程规划系统,包含成本分析与工程落地代码。

一、价格对比:为什么旅游场景必须选对 API 提供商

旅游 AI 助手的核心场景是多轮对话 + 工具调用,单次行程规划可能消耗 50-200k token。以每月服务 10 万用户、每人平均 3 次规划计算,月消耗 token 量轻松突破 1 亿。此时 API 成本直接决定商业可行性。

主流模型 Output 价格对比(2026年主流)

模型官方价格100万 Token 美元成本折合人民币(官方汇率)通过 HolySheep(¥1=$1)
GPT-4.1$8/MTok$8¥58.4¥8
Claude Sonnet 4.5$15/MTok$15¥109.5¥15
Gemini 2.5 Flash$2.50/MTok$2.5¥18.25¥2.5
DeepSeek V3.2$0.42/MTok$0.42¥3.07¥0.42

100万 Token 实际费用差距计算

以 DeepSeek V3.2 为例(性价比最优):

对于月消耗 1 亿 Token 的大型旅游平台,选择 HolySheep 可节省 ¥26,500/月(DeepSeek 场景)。HolySheep 支持微信/支付宝充值、国内直连延迟 <50ms,是国内旅游 AI 应用的最优选择。

二、系统架构设计

核心流程

用户: "我想去云南玩5天,预算8000块"

┌─────────────────────────────────────────────────────────┐
│                    对话管理器                            │
│  ┌──────────┐  ┌──────────┐  ┌──────────────────────┐  │
│  │ 意图识别 │→ │ 实体提取 │→ │ 对话状态更新/澄清提问 │  │
│  └──────────┘  └──────────┘  └──────────────────────┘  │
└─────────────────────────────────────────────────────────┘
                          ↓ 确认后触发
┌─────────────────────────────────────────────────────────┐
│                    工具调用层                            │
│  ┌─────────┐  ┌─────────┐  ┌─────────┐  ┌─────────┐   │
│  │机票查询 │  │酒店搜索 │  │景点推荐 │  │天气预报 │   │
│  └─────────┘  └─────────┘  └─────────┘  └─────────┘   │
└─────────────────────────────────────────────────────────┘
                          ↓
┌─────────────────────────────────────────────────────────┐
│              行程规划 & 输出渲染                         │
└─────────────────────────────────────────────────────────┘

对话状态数据结构

class TripState:
    """行程规划对话状态"""
    
    def __init__(self):
        # 用户基本信息
        self.destination: Optional[str] = None      # 目的地
        self.duration: Optional[int] = None          # 天数
        self.budget: Optional[float] = None          # 预算
        self.travelers: int = 1                      # 出行人数
        
        # 偏好标签
        self.preferences: List[str] = []             # 偏好标签列表
        self.avoid: List[str] = []                   # 避免标签
        
        # 约束条件
        self.travel_style: str = "normal"             # 穷游/normal/豪华
        self.with_kids: bool = False                  # 是否带小孩
        self.with_elderly: bool = False               # 是否带老人
        
        # 行程中间结果
        self.flight_options: List[dict] = []
        self.hotel_options: List[dict] = []
        self.attractions: List[dict] = []
        
        # 对话历史(用于上下文理解)
        self.history: List[dict] = []

    def is_complete(self) -> bool:
        """判断是否收集到足够信息"""
        return all([
            self.destination,
            self.duration and self.duration > 0,
            self.budget and self.budget > 0
        ])
    
    def missing_fields(self) -> List[str]:
        """返回缺失的必要字段列表"""
        missing = []
        if not self.destination:
            missing.append("目的地")
        if not self.duration:
            missing.append("行程天数")
        if not self.budget:
            missing.append("预算金额")
        return missing

三、工具调用(Function Calling)实现

1. 定义工具函数规范

import json
from openai import OpenAI

初始化 HolySheep API 客户端

client = OpenAI( api_key="YOUR_HOLYSHEEP_API_KEY", # 替换为你的 HolySheep API Key base_url="https://api.holysheep.ai/v1" )

定义行程规划相关的工具函数

TRAVEL_TOOLS = [ { "type": "function", "function": { "name": "search_flights", "description": "搜索符合条件的航班", "parameters": { "type": "object", "properties": { "departure": {"type": "string", "description": "出发城市"}, "destination": {"type": "string", "description": "目的地城市"}, "date": {"type": "string", "description": "出发日期 YYYY-MM-DD"}, "budget_per_person": {"type": "number", "description": "每人预算上限"} }, "required": ["departure", "destination", "date"] } } }, { "type": "function", "function": { "name": "search_hotels", "description": "搜索目的地酒店", "parameters": { "type": "object", "properties": { "city": {"type": "string", "description": "城市名称"}, "check_in": {"type": "string", "description": "入住日期"}, "check_out": {"type": "string", "description": "退房日期"}, "budget_per_night": {"type": "number", "description": "每晚预算上限"}, "requirements": { "type": "string", "description": "特殊需求(如:亲子房、无障碍设施)" } }, "required": ["city", "check_in", "check_out"] } } }, { "type": "function", "function": { "name": "get_attractions", "description": "获取目的地景点推荐", "parameters": { "type": "object", "properties": { "city": {"type": "string", "description": "城市名称"}, "days": {"type": "integer", "description": "停留天数"}, "preferences": { "type": "array", "items": {"type": "string"}, "description": "用户偏好标签" } }, "required": ["city", "days"] } } }, { "type": "function", "function": { "name": "check_weather", "description": "查询目的地天气预报", "parameters": { "type": "object", "properties": { "city": {"type": "string", "description": "城市名称"}, "start_date": {"type": "string", "description": "开始日期"}, "end_date": {"type": "string", "description": "结束日期"} }, "required": ["city", "start_date", "end_date"] } } } ]

2. 工具执行器

import re
from datetime import datetime, timedelta

def execute_tool(tool_name: str, arguments: dict) -> dict:
    """
    执行具体的工具调用
    实际项目中这里会调用真实的机票、酒店、天气 API
    """
    
    if tool_name == "search_flights":
        # 模拟航班搜索结果
        return {
            "status": "success",
            "flights": [
                {
                    "airline": "东方航空",
                    "flight_no": "MU5801",
                    "departure": "上海浦东",
                    "destination": arguments["destination"],
                    "price": 890,
                    "departure_time": "08:30",
                    "arrival_time": "11:45"
                },
                {
                    "airline": "春秋航空",
                    "flight_no": "9C8919",
                    "departure": "上海虹桥",
                    "destination": arguments["destination"],
                    "price": 599,
                    "departure_time": "14:20",
                    "arrival_time": "17:35"
                }
            ]
        }
    
    elif tool_name == "search_hotels":
        city = arguments["city"]
        nights = (datetime.strptime(arguments["check_out"], "%Y-%m-%d") - 
                  datetime.strptime(arguments["check_in"], "%Y-%m-%d")).days
        
        return {
            "status": "success",
            "hotels": [
                {
                    "name": f"{city}希尔顿酒店",
                    "rating": 4.7,
                    "price_per_night": 680,
                    "total_price": 680 * nights,
                    "location": "市中心",
                    "amenities": ["免费WiFi", "停车场", "健身房"]
                },
                {
                    "name": f"{city}如家精选",
                    "rating": 4.3,
                    "price_per_night": 258,
                    "total_price": 258 * nights,
                    "location": "火车站附近",
                    "amenities": ["免费WiFi", "早餐"]
                }
            ]
        }
    
    elif tool_name == "get_attractions":
        city = arguments["city"]
        day = arguments["days"]
        
        attractions_db = {
            "云南": [
                {"name": "石林风景区", "duration": "3小时", "ticket": 130, "must_see": True},
                {"name": "大理古城", "duration": "4小时", "ticket": 0, "must_see": True},
                {"name": "洱海", "duration": "5小时", "ticket": 0, "must_see": True},
                {"name": "丽江古城", "duration": "4小时", "ticket": 0, "must_see": True},
                {"name": "玉龙雪山", "duration": "6小时", "ticket": 180, "must_see": True}
            ],
            "三亚": [
                {"name": "蜈支洲岛", "duration": "6小时", "ticket": 144, "must_see": True},
                {"name": "天涯海角", "duration": "3小时", "ticket": 81, "must_see": False},
                {"name": "南山文化旅游区", "duration": "4小时", "ticket": 121, "must_see": True}
            ]
        }
        
        return {
            "status": "success",
            "attractions": attractions_db.get(city, []),
            "suggested_daily_plan": f"建议每天安排2-3个景点,避免过度疲劳"
        }
    
    elif tool_name == "check_weather":
        return {
            "status": "success",
            "weather": [
                {"date": arguments["start_date"], "temp": "18-25°C", "condition": "多云"},
                {"date": (datetime.strptime(arguments["start_date"], "%Y-%m-%d") + timedelta(days=1)).strftime("%Y-%m-%d"), 
                 "temp": "20-28°C", "condition": "晴"}
            ],
            "tips": "云南早晚温差大,建议携带薄外套"
        }
    
    return {"status": "error", "message": f"Unknown tool: {tool_name}"}

3. 多轮对话主循环

def chat_about_trip(messages: list, user_input: str, trip_state: TripState) -> dict:
    """
    处理单轮对话,返回响应和工具调用结果
    """
    # 1. 解析用户输入,更新状态
    trip_state.history.append({"role": "user", "content": user_input})
    
    # 2. 构建系统提示词(包含状态上下文)
    system_prompt = f"""你是一个专业的旅游规划助手。
    
当前行程状态:
- 目的地:{trip_state.destination or '待确认'}
- 天数:{trip_state.duration or '待确认'}
- 预算:{trip_state.budget or '待确认'}
- 出行人数:{trip_state.travelers}
- 偏好:{', '.join(trip_state.preferences) if trip_state.preferences else '未设置'}
- 旅行风格:{trip_state.travel_style}

请通过多轮对话收集完整的旅行信息。如果信息不足,主动询问缺失项。
如果信息完整,主动调用工具获取数据并生成行程规划。

记住:
1. 用友好的中文与用户交流
2. 一次只问1-2个关键问题
3. 确认信息后立即调用工具
4. 工具调用使用 function_call 格式"""

    # 3. 调用 API(使用 DeepSeek V3.2,性价比最高)
    response = client.chat.completions.create(
        model="deepseek-chat",
        messages=[
            {"role": "system", "content": system_prompt},
            *trip_state.history
        ],
        tools=TRAVEL_TOOLS,
        tool_choice="auto",
        temperature=0.7,
        max_tokens=2048
    )
    
    assistant_message = response.choices[0].message
    trip_state.history.append({
        "role": "assistant", 
        "content": assistant_message.content or ""
    })
    
    # 4. 处理工具调用
    result = {
        "reply": assistant_message.content,
        "tool_calls": []
    }
    
    if assistant_message.tool_calls:
        for tool_call in assistant_message.tool_calls:
            func_name = tool_call.function.name
            func_args = json.loads(tool_call.function.arguments)
            
            # 执行工具
            tool_result = execute_tool(func_name, func_args)
            result["tool_calls"].append({
                "name": func_name,
                "args": func_args,
                "result": tool_result
            })
            
            # 将工具结果加入对话历史(用于生成最终回复)
            trip_state.history.append({
                "role": "tool",
                "tool_call_id": tool_call.id,
                "content": json.dumps(tool_result, ensure_ascii=False)
            })
        
        # 5. 基于工具结果生成最终行程
        final_response = client.chat.completions.create(
            model="deepseek-chat",
            messages=[
                {"role": "system", "content": "根据已获取的工具数据,生成完整的行程规划方案。用友好的中文回复。"},
                *trip_state.history
            ],
            max_tokens=2048
        )
        result["