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LLM API 学习笔记 04 - 多轮对话

  • 2026-05-25 21:21:02
LLM API 学习笔记 04 - 多轮对话

前面的示例中,每次请求都是独立的,模型只会根据当前提问生成回复,并不会记住之前的聊天内容。

如果希望实现“连续聊天”,就需要把历史对话一起传给模型,也就是多轮对话。

多轮对话的核心原理

LLM 本身并不会“记忆”之前的聊天内容。

所谓多轮对话,本质上是“每次请求时,把历史消息重新发送给模型”。

举一个例子,下面的对话包含两次请求和两次回复:

User:你好
AI:你好,有什么可以帮助你的?

User:我想学习 Python
AI:Python 很适合作为编程入门语言。

第二次请求时,实际上传给模型的是:

messages = [
    {"role": "user", "content": "你好"},
    {"role": "assistant", "content": "你好,有什么可以帮助你的?"},
    {"role": "user", "content": "我想学习 Python"},
]

模型通过完整上下文,理解当前对话,并生成下一条回复。

核心流程

初始化 client

创建 OpenAI-compatible API 对应的 client。

import os
from
 openai import OpenAI

client = OpenAI(
    api_key=os.getenv("DEEPSEEK_API_KEY"),
    base_url="https://api.deepseek.com"
)

创建 messages

messages = []

所有历史消息都会存储到 messages 列表中,每条消息都包含:

role:角色
content:消息内容

当前示例涉及两个角色:

user:用户输入
assistant:模型输出

开启聊天循环

使用 while True 持续读取用户输入,实现一个最基础的命令行聊天循环。

print("开始对话(输入 exit 退出)\n")

while
 True:
    user_input = input("User:")
    if
 user_input == "exit":
        break

    ...

保存用户消息

用户输入后,需要先追加到 messages,messages 必须保存完整且有顺序的历史消息,因为模型是按照消息顺序理解对话的。

while True:
    ...
    messages.append({
        "role"
: "user",
        "content"
: user_input
    })

发起 API 请求

把完整 messages 发送给模型,stream=True 让模型以流式方式逐步返回内容。

while True:
    ...
    response = client.chat.completions.create(
        model="deepseek-v4-flash",
        messages=messages,
        stream=True
    )

流式输出模型回复

先打印 AI 前缀,然后定义一个变量 full_reply,用于拼接完整回复。

接着遍历流式返回的 chunk,拼接到 full_reply,同时实时打印到终端。

while True:
    ...
    print
("AI: ", end="", flush=True)
    full_reply = ""
    for
 chunk in response:
        content = chunk.choices[0].delta.content
        if
 content is not None:
            print
(content, end="", flush=True)
            full_reply += content

保存 assistant 回复

模型输出结束后,需要把完整回复重新追加到 messages,这样下一轮请求时,模型才能看到自己刚才的回复。

while True:
    ...

    messages.append({
        "role"
: "assistant",
        "content"
: full_reply
    })

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  1. 请求信息 : 2026-05-26 02:32:26 HTTP/2.0 GET : https://67808.cn/a/490714.html
  2. 运行时间 : 0.092792s [ 吞吐率:10.78req/s ] 内存消耗:4,397.66kb 文件加载:140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=8ad9fa5a455c0000db22e1ae2ea88440
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  138. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/no.67808.cn/runtime/temp/6df755f970a38e704c5414acbc6e8bcd.php ( 12.06 KB )
  140. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000454s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000739s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000341s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000470s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000557s ]
  8. SELECT * FROM `article` WHERE `id` = 490714 LIMIT 1 [ RunTime:0.000515s ]
  9. UPDATE `article` SET `lasttime` = 1779733946 WHERE `id` = 490714 [ RunTime:0.013151s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000350s ]
  11. SELECT * FROM `article` WHERE `id` < 490714 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000523s ]
  12. SELECT * FROM `article` WHERE `id` > 490714 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001147s ]
  13. SELECT * FROM `article` WHERE `id` < 490714 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004755s ]
  14. SELECT * FROM `article` WHERE `id` < 490714 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001066s ]
  15. SELECT * FROM `article` WHERE `id` < 490714 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002048s ]
0.094383s