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开发AI-Agent,需要掌握python哪些基础知识

  • 2026-08-21 23:08:53
开发AI-Agent,需要掌握python哪些基础知识

开发 AI Agent(ReAct / LangGraph / LangChain)必学 Python 知识清单


目标做工具调用、循环智能体、多步骤流程,分基础刚需、AI 框架专用、工程进阶三部分,只讲真正用得上的,剔除无用知识点。

一、Python 核心基础(必须吃透,90% Agent 代码必懂)

1. 基础语法与数据结构

  1. 变量、字符串、格式化输出 f-stringAgent 大量拼接提示词、日志、工具入参,f"Thought:{xxx}" 高频使用。

  2. 列表 List、字典 Dict

    1. List:存储对话历史 messages = [user_msg, llm_msg, tool_msg]

    2. Dict:存储工具参数、状态 State、接口返回 JSON

  3. 元组 Tuple、集合 Set(次要,简单了解即可)

  4. 分支 if /elif/elseLangGraph 条件路由、ReAct 判断是否调用工具全靠分支逻辑

    1. if last_msg.tool_calls:    return "tools"else:    return END

  5. 循环 for /while多轮工具调用循环、批量处理文档、遍历工具列表

  6. 函数 def、参数(位置参数 / 关键字参数)、return 返回值LangGraph 所有节点都是函数,接收 State、返回更新字典,重中之重。

  7. 注释、异常捕获 try-except大模型调用、网络搜索极易报错,必须学会捕获超时、接口失败。

    1. try:    res = llm.invoke(messages)except Exception as e:    print("调用失败:", e)

2. 高阶函数与类型注解(AI 框架强制依赖)

  1. 类型提示 TypedDict / PydanticLangGraph 定义全局 State 标准写法,你之前看到的代码全部基于它:

    1. from typing import TypedDict, Listclass ChatState(TypedDict):    messages: List

  2. 装饰器 @toolLangChain 定义工具专用语法,写自定义搜索 / 计算工具必备:

    1. @tooldef search(query: str) -> str:    """联网搜索"""    return ...

  3. \\*args / kwargs 可变参数封装通用 LLM 调用、通用工具函数高频用到

  4. lambda 匿名函数(简单了解)

3. 文件、模块、包管理

  1. 导入 import /from xxx import xxx导入 langgraph、langchain、openai、工具库是日常操作

  2. 模块拆分把工具、节点、图逻辑拆分多个 .py 文件,大型 Agent 必备

  3. pip 包管理器(重中之重)

    1. pip install xxxpip uninstall xxxpip listpip freeze > requirements.txt # 导出依赖给项目

        AI 开发核心命令,安装 LangGraph、OpenAI、向量库全靠它。

  4. 虚拟环境 venv(避坑神器)不同 AI 项目依赖版本冲突,必须学会隔离环境:

    1. python3 -m venv agent_envsource agent_env/bin/activate

4. JSON 数据处理(Agent 刚需)

大模型输出、工具返回、接口响应全是 JSON 格式

import json# 字典转字符串、字符串转字典json.dumps()json.loads()

解析工具调用参数、提取 Thought、Action 全部依赖。

二、AI Agent 专属 Python 专项知识(做 ReAct / LangGraph 直接用到)

1. 面向对象基础 Class

  • Pydantic BaseModel:结构化校验工具入参、对话数据

  • 自定义 LLM 封装、自定义工具类、多智能体封装 只需要基础:class__init__、实例方法,不用深挖继承多态。

2. 异步编程基础(可选但推荐)

async / await,大量并发问答、批量 Agent 任务会用到,LangChain 支持异步 LLM 调用。

3. 网络请求库

requests:调用联网搜索、本地 API、第三方大模型接口(文心 / 通义 / OpenAI)

import requestsresp = requests.get("xxx")data = resp.json()

4. 基础日志 logging

打印每一步 Thought、工具返回、路由记录,调试 LangGraph 流程必备。

三、工程进阶(复杂 Agent、生产部署)

  1. 环境变量 os.environ /python-dotenv 存储 API Key,不要明文写密钥:

    1. from dotenv import load_dotenvload_dotenv()import osapi_key = os.getenv("OPENAI_API_KEY")

  2. 简易数据库(sqlite3) 存储对话历史、检查点缓存,搭配 LangGraph Checkpointer 持久化流程。

  3. 命令行参数 argparse 启动 Agent 脚本自定义参数。

四、不用深入学的内容(新手不用浪费时间)

  1. 爬虫高级、GUI 界面、并发多进程、深度学习底层(torch 不用细学,调用封装好的库即可)

  2. 算法、数据结构难题(Agent 开发极少用到)


最简入门实战案例(学完基础就能跑)

# 类型注解 + 函数 + 字典 + pip安装langgraphfrom typing import TypedDict, Listfrom langgraph.graph import StateGraph, START, END# 1.类型注解定义状态(TypedDict)class State(TypedDict):    messages: List[str]# 2.节点函数(def+return更新state)def think(state: State):    res = "我需要搜索信息"    return {"messages": state["messages"] + [res]}# 3.初始化图、流转逻辑graph = StateGraph(State)graph.add_node("llm_think", think)graph.set_entry_point("llm_think")graph.add_edge("llm_think", END)app = graph.compile()# 4.调用执行result = app.invoke({"messages": ["2026 AI发展趋势"]})print(result["messages"])


学习路线(适配你的 AI-Agent 目标)

  1. 第一阶段(1~3 天):基础语法 + 字典 / 列表 + 函数 + pip + json

  2. 第二阶段(3~5 天):类型注解 TypedDict / Pydantic + 装饰器 @tool + 虚拟环境

  3. 第三阶段:学会 requests、dotenv,直接上手写简单 ReAct 工具 Agent

  4. 第四阶段:深入 LangGraph 节点、状态、条件边,搭建循环多工具智能体

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  1. CONNECT:[ UseTime:0.001259s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001837s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000716s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000622s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001345s ]
  6. SELECT * FROM `set` [ RunTime:0.000556s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000596s ]
  8. SELECT * FROM `article` WHERE `id` = 505053 LIMIT 1 [ RunTime:0.003925s ]
  9. UPDATE `article` SET `lasttime` = 1787335093 WHERE `id` = 505053 [ RunTime:0.031515s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000764s ]
  11. SELECT * FROM `article` WHERE `id` < 505053 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001495s ]
  12. SELECT * FROM `article` WHERE `id` > 505053 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001299s ]
  13. SELECT * FROM `article` WHERE `id` < 505053 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002359s ]
  14. SELECT * FROM `article` WHERE `id` < 505053 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002229s ]
  15. SELECT * FROM `article` WHERE `id` < 505053 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001919s ]
0.211667s