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LangGraph学习笔记9-TypedDict 类型系统

  • 2026-04-08 18:40:39
LangGraph学习笔记9-TypedDict 类型系统

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📌 本章目标

  • • 理解 TypedDict 的作用和基本用法
  • • 掌握必需字段和可选字段的定义
  • • 学习 Annotated、Literal、Union 等高级类型
  • • 了解 TypedDict 在 LangGraph 中的应用

1️⃣ 什么是 TypedDict?

问题背景

Python 的普通字典没有类型约束:

# 普通字典 - 没有类型检查person = {    "name": "张三",    "age": 25,    "email": "zhangsan@example.com"}# 这些操作都不会报错,但可能导致问题person["age"] = "二十五"  # 类型错误:应该是 intperson["phone"] = 12345   # 添加了未定义的字段

TypedDict 的作用

TypedDict 为字典提供了类型约束

from typing_extensions import TypedDictclass Person(TypedDict):    name: str    age: int    email: str# 类型检查器会提示错误person: Person = {    "name": "张三",    "age": "二十五",  # ❌ 类型错误:应该是 int    # "email": "xxx"  # ❌ 缺少必需字段}

2️⃣ 基本用法

定义方式

from typing_extensions import TypedDict# 方式1: 使用 class 语法(推荐)class Person(TypedDict):    name: str    age: int    email: str# 方式2: 使用函数语法PersonDict = TypedDict('PersonDict', {    'name': str,    'age': int,    'email': str})

创建和使用

# 创建实例person: Person = {    'name': '张三',    'age': 25,    'email': 'zhangsan@example.com'}# 访问数据(就像普通字典)print(person['name'])   # 张三print(person['age'])    # 25# 修改数据person['age'] = 26# 遍历for key, value in person.items():    print(f"{key}: {value}")

3️⃣ 必需字段和可选字段

默认行为

默认情况下,所有字段都是必需的

class Person(TypedDict):    name: str   # 必需    age: int    # 必需    email: str  # 必需# ❌ 缺少字段会报错person: Person = {"name": "张三"}  # 缺少 age 和 email

方式1:total=False

让所有字段都可选:

class OptionalPerson(TypedDict, total=False):    name: str   # 可选    age: int    # 可选    email: str  # 可选# ✅ 可以只提供部分字段person: OptionalPerson = {"name": "张三"}

方式2:组合继承(推荐)

分别定义必需和可选字段:

class UserRequired(TypedDict):    """必需字段"""    id: int    username: strclass UserOptional(TypedDict, total=False):    """可选字段"""    email: str    phone: str    avatar: strclass User(UserRequired, UserOptional):    """组合:必需 + 可选"""    pass# ✅ 只提供必需字段user1: User = {"id": 1, "username": "alice"}# ✅ 提供所有字段user2: User = {    "id": 2,    "username": "bob",    "email": "bob@example.com",    "phone": "13800138000"}

方式3:Optional 类型

表示字段可以是 None:

from typing import Optionalclass UserWithNone(TypedDict):    id: int    username: str    phone: Optional[str]  # 可以是 str 或 Noneuser: UserWithNone = {    "id": 1,    "username": "alice",    "phone": None  # ✅ 明确设置为 None}

4️⃣ Annotated:添加元数据

基本用法

from typing import Annotatedclass UserProfile(TypedDict):    # 基础字段 + 说明    user_id: Annotated[int, "用户唯一标识符"]    username: Annotated[str, "用户名,3-20个字符"]    # 带验证规则的字段    age: Annotated[int, "年龄,必须在0-150之间"]    phone: Annotated[str, "手机号,格式: 13800138000"]

在 LangGraph 中的应用

from typing import Annotatedimport operatorclass ScoreState(TypedDict):    # 使用 Annotated 添加 Reducer    score: Annotated[int, operator.add]      # 累加    actions: Annotated[list[str], operator.add]  # 列表合并

5️⃣ Literal:限制取值范围

基本用法

from typing import Literalclass OrderStatus(TypedDict):    order_id: str    # 只能是指定的几个值    status: Literal['pending', 'processing', 'shipped', 'delivered', 'cancelled']    payment_method: Literal['credit_card', 'alipay', 'wechat', 'cash']# ✅ 正确order: OrderStatus = {    "order_id": "ORD-001",    "status": "processing",    "payment_method": "alipay"}# ❌ 错误:status 值不在允许范围内order2: OrderStatus = {    "order_id": "ORD-002",    "status": "unknown",  # ❌ 不在 Literal 中    "payment_method": "alipay"}

在 LangGraph 中的应用

class CustomerServiceState(TypedDict):    priority: Literal["low", "medium", "high"]  # 优先级    category: Literal["technical", "refund", "general"]  # 问题类别

6️⃣ Union:多类型选择

基本用法

from typing import Union, Literalclass TextMessage(TypedDict):    type: Literal['text']    content: strclass ImageMessage(TypedDict):    type: Literal['image']    url: str    width: int    height: intclass VideoMessage(TypedDict):    type: Literal['video']    url: str    duration: int# 消息可以是以上任意一种类型Message = Union[TextMessage, ImageMessage, VideoMessage]def process_message(msg: Message):    if msg['type'] == 'text':        print(f"文本消息: {msg['content']}")    elif msg['type'] == 'image':        print(f"图片消息: {msg['url']}")    elif msg['type'] == 'video':        print(f"视频消息: {msg['url']}")

7️⃣ 嵌套 TypedDict

定义嵌套结构

class Address(TypedDict):    street: str    city: str    country: strclass PersonWithAddress(TypedDict):    name: str    age: int    address: Address  # 嵌套另一个 TypedDict# 创建实例person: PersonWithAddress = {    'name': '王五',    'age': 28,    'address': {        'street': '中关村大街1号',        'city': '北京',        'country': '中国'    }}# 访问嵌套数据print(person['address']['city'])  # 北京

8️⃣ 实际应用示例

API 响应

class APIError(TypedDict):    code: int    message: strclass APIResponse(TypedDict):    success: bool    data: dict    error: APIErrordef create_success_response(data: dict) -> APIResponse:    return {        'success': True,        'data': data,        'error': {'code': 0, 'message': ''}    }def create_error_response(code: int, message: str) -> APIResponse:    return {        'success': False,        'data': {},        'error': {'code': code, 'message': message}    }

购物车系统

class CartItem(TypedDict):    product_id: int    name: str    price: float    quantity: intclass ShoppingCart(TypedDict):    user_id: int    items: list[CartItem]    total: floatdef calculate_total(cart: ShoppingCart) -> float:    return sum(item['price'] * item['quantity'] for item in cart['items'])

配置管理

class DatabaseConfig(TypedDict):    host: str    port: int    database: str    username: str    password: strclass AppConfig(TypedDict):    app_name: str    debug: bool    database: DatabaseConfigconfig: AppConfig = {    'app_name': 'MyApp',    'debug': True,    'database': {        'host': 'localhost',        'port': 3306,        'database': 'myapp_db',        'username': 'root',        'password': 'password'    }}

9️⃣ TypedDict vs 其他类型

特性
TypedDict
dataclass
Pydantic
类型检查
✅ 静态
✅ 静态
✅ 运行时
运行时验证
性能
较低
序列化
手动
手动
自动
适用场景
简单数据
结构化数据
API/配置

📊 LangGraph 中的 TypedDict

State 定义

from typing_extensions import TypedDictfrom typing import Annotatedimport operatorclass MyState(TypedDict):    # 简单字段    name: str    count: int    # 带 Reducer 的字段    score: Annotated[int, operator.add]    history: Annotated[list[str], operator.add]    # Literal 类型    status: Literal["pending", "processing", "done"]    # 可选字段    error: Optional[str]

MessagesState

from langgraph.graph import MessagesStateclass ChatState(MessagesState):    """继承 MessagesState,自动包含 messages 字段"""    user_name: str    conversation_count: int

🎯 小结

概念
要点
TypedDict
为字典提供类型约束
total=False
让所有字段可选
组合继承
分别定义必需和可选字段
Annotated
添加元数据或 Reducer
Literal
限制字段值为特定选项
Union
表示多种类型选择

🎉 教程完成!

恭喜你完成了 LangGraph 完整教程的学习!

学习回顾

章节
核心内容
01 快速入门
LangGraph 基础概念
02 核心概念
State、Node、Edge
03 条件分支与循环
条件边、循环结构
04 Reducer
状态合并机制
05 完整应用
智能客服系统
06 Agent 开发
ReAct Agent、工具调用
07 多 Agent 协作
Supervisor 模式
08 TypedDict
类型系统基础

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  1. CONNECT:[ UseTime:0.000788s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000897s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000432s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000536s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000886s ]
  6. SELECT * FROM `set` [ RunTime:0.000384s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001154s ]
  8. SELECT * FROM `article` WHERE `id` = 479795 LIMIT 1 [ RunTime:0.004046s ]
  9. UPDATE `article` SET `lasttime` = 1775654717 WHERE `id` = 479795 [ RunTime:0.013621s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000431s ]
  11. SELECT * FROM `article` WHERE `id` < 479795 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000723s ]
  12. SELECT * FROM `article` WHERE `id` > 479795 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000658s ]
  13. SELECT * FROM `article` WHERE `id` < 479795 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001300s ]
  14. SELECT * FROM `article` WHERE `id` < 479795 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014027s ]
  15. SELECT * FROM `article` WHERE `id` < 479795 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005127s ]
0.166026s