Initial commit
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from typing import List
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import os
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from langchain_core.prompts import PromptTemplate
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from pydantic import BaseModel, Field
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from langchain_core.output_parsers import PydanticOutputParser
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from langchain_deepseek import ChatDeepSeek
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# 初始化 LLM
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llm = ChatDeepSeek(
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model="deepseek-chat",
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api_key=os.getenv("DEEPSEEK_API_KEY")
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)
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# 1. 定义数据结构
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class PersonInfo(BaseModel):
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name: str = Field(description="人物姓名")
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age: int = Field(description="人物年龄")
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skills: List[str] = Field(description="技能列表")
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# 2. 创建解析器
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parser = PydanticOutputParser(pydantic_object=PersonInfo)
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# 3. 创建提示模板
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prompt = PromptTemplate(
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template="请根据以下文本提取信息。\n{format_instructions}\n{text}\n",
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input_variables=["text"],
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partial_variables={"format_instructions": parser.get_format_instructions()},
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)
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# # 打印格式指令
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# print("\n--- Format Instructions ---")
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# print(parser.get_format_instructions())
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# print("--------------------------\n")
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# 4. 创建处理链
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chain = prompt | llm | parser
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# 5. 定义输入文本并执行调用链
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text = "张三今年30岁,他擅长Python和Go语言。"
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result = chain.invoke({"text": text})
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# 6. 打印结果
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print("\n--- 解析结果 ---")
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print(f"结果类型: {type(result)}")
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print(result)
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print("--------------------\n")
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print(f"姓名: {result.name}")
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print(f"年龄: {result.age}")
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print(f"技能: {result.skills}")
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from openai import OpenAI
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import os
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# 初始化 OpenAI 客户端
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client = OpenAI(
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api_key=os.getenv("DEEPSEEK_API_KEY"),
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base_url="https://api.deepseek.com",
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)
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# 定义一个函数,用于发送消息并获取模型的响应
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def send_messages(messages, tools=None):
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response = client.chat.completions.create(
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model="deepseek-chat",
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messages=messages,
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tools=tools,
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tool_choice="auto", # 让模型自主决定是否调用工具
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)
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return response.choices[0].message
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# 1. 定义工具(函数)的 Schema
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tools = [
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{
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"type": "function",
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"function": {
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"name": "get_weather",
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"description": "获取指定地点的天气信息",
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"parameters": {
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"type": "object",
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"properties": {
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"location": {
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"type": "string",
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"description": "城市和省份,例如:杭州市, 浙江省",
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}
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},
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"required": ["location"]
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},
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}
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},
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]
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# 1. 用户提问,模型决策调用工具
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messages = [{"role": "user", "content": "杭州今天天气怎么样?"}]
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print(f"User> {messages[0]['content']}\n")
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message = send_messages(messages, tools=tools)
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# 2. 执行工具,并将结果返回模型
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if message.tool_calls:
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print("--- 模型发起了工具调用 ---")
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tool_call = message.tool_calls[0]
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function_info = tool_call.function
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print(f"工具名称: {function_info.name}")
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print(f"工具参数: {function_info.arguments}")
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# 将模型的回复(包含工具调用请求)添加到消息历史中
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messages.append(message)
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# 模拟执行工具
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tool_output = "24℃,晴朗"
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print(f"--- 执行工具并返回结果 ---")
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print(f"工具执行结果: {tool_output}\n")
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# 将工具的执行结果作为一个新的消息添加到历史中
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messages.append({"role": "tool", "tool_call_id": tool_call.id, "content": tool_output})
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# 3. 第二次调用:将工具结果返回给模型,获取最终回答
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print("--- 将工具结果返回给模型,获取最终答案 ---")
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final_message = send_messages(messages, tools=tools)
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print(f"Model> {final_message.content}")
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else:
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# 如果模型没有调用工具,直接打印其回答
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print(f"Model> {message.content}")
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