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LangGraph学习笔记-1

  • 2026-03-08 00:23:13
LangGraph学习笔记-1

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LangGraph学习笔记-1

📚 简介

LangGraph 是构建在 LangChain 之上的框架,专门用于创建有状态的、基于图的 AI 应用程序。本教程通过一系列由浅入深的代码案例,帮助你掌握 LangGraph 的核心概念和实战技能。


📖 目录结构

第一部分:基础入门

章节
标题
难度
对应代码
01_快速入门
5分钟上手 LangGraph
graph_node_edge.py
02_核心概念
State、Node、Edge 详解
⭐⭐
graph_node_edge.py
 - graph_node_edge2.py
03_条件分支与循环
条件路由与循环结构
⭐⭐⭐
graph_node_edge3.py
 - graph_node_edge4.py
04_Reducer状态管理
状态累加与合并策略
⭐⭐
graph_node_edge2.py
graph_node_edge5.py

第二部分:进阶应用

章节
标题
难度
对应代码
05_完整应用案例
智能客服系统实战
⭐⭐⭐
graph_node_edge6.py
 - langgraph_2.py
06_Agent开发指南
ReAct Agent 与工具调用
⭐⭐⭐⭐
langgraph_agent_*.py
07_多Agent协作
Supervisor 模式详解
⭐⭐⭐⭐
langgraph_supervisor_*.py

第三部分:类型系统

章节
标题
难度
对应代码
08_TypedDict类型系统
Python 类型注解基础
⭐⭐
typeddict_test*.py

🎯 学习路径

┌─────────────────────────────────────────────────────────────┐
│                     LangGraph 学习路径                        │
├─────────────────────────────────────────────────────────────┤
│                                                             │
│  基础概念 ──→ 条件分支 ──→ 循环结构 ──→ Reducer             │
│     │           │            │            │                 │
│     ↓           ↓            ↓            ↓                 │
│  [01-02]     [03]         [03]         [04]                │
│                                                             │
│                         ↓                                   │
│                                                             │
│              完整应用 ──→ Agent开发 ──→ 多Agent协作          │
│                  │           │              │               │
│                  ↓           ↓              ↓               │
│               [05]        [06]           [07]              │
│                                                             │
│                         ↓                                   │
│                                                             │
│                    类型系统基础                              │
│                       [08]                                  │
│                                                             │
└─────────────────────────────────────────────────────────────┘

🔧 环境准备

安装依赖

pip install langgraph langchain langchain-community
pip install typing_extensions

配置 API Key

import os
os.environ["DASHSCOPE_API_KEY"] = "your-api-key-here"

💡 核心概念速览

LangGraph 是什么?

LangGraph 是一个用于构建有状态、多参与者应用程序的库,特别适合构建 AI Agent 系统。

核心三要素

┌─────────────────────────────────────────────────┐
│                  LangGraph 三要素                 │
├─────────────────────────────────────────────────┤
│                                                 │
│  1️⃣ State(状态)                                │
│     └─ 在节点间传递的共享数据结构                  │
│                                                 │
│  2️⃣ Node(节点)                                 │
│     └─ 执行具体任务的函数                         │
│                                                 │
│  3️⃣ Edge(边)                                   │
│     └─ 定义节点间的执行顺序和条件                  │
│                                                 │
└─────────────────────────────────────────────────┘

基本工作流程

# 1. 定义状态
class
 MyState(TypedDict):
    count: int

# 2. 定义节点函数

def
 my_node(state: MyState):
    return
 {"count": state["count"] + 1}

# 3. 构建图

workflow = StateGraph(MyState)
workflow.add_node("node1", my_node)
workflow.add_edge(START, "node1")
workflow.add_edge("node1", END)

# 4. 编译并运行

app = workflow.compile()
result = app.invoke({"count": 0})

🔗 相关资源

  • • LangGraph 官方文档
  • • LangChain 官方文档
  • • Python TypedDict 文档

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  1. CONNECT:[ UseTime:0.001074s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001641s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000751s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000701s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001453s ]
  6. SELECT * FROM `set` [ RunTime:0.000572s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001536s ]
  8. SELECT * FROM `article` WHERE `id` = 471894 LIMIT 1 [ RunTime:0.016052s ]
  9. UPDATE `article` SET `lasttime` = 1772918567 WHERE `id` = 471894 [ RunTime:0.011828s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000668s ]
  11. SELECT * FROM `article` WHERE `id` < 471894 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002062s ]
  12. SELECT * FROM `article` WHERE `id` > 471894 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001167s ]
  13. SELECT * FROM `article` WHERE `id` < 471894 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002287s ]
  14. SELECT * FROM `article` WHERE `id` < 471894 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005152s ]
  15. SELECT * FROM `article` WHERE `id` < 471894 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.033351s ]
0.250100s