LangChain All In One

LangChain All In One

LangChain is a framework for building agents and LLM-powered applications. It helps you chain together interoperable components and third-party integrations to simplify AI application development – all while future-proofing decisions as the underlying technology evolves.

LangChain 是一个用于构建智能体和基于 LLM 的应用程序的框架。它可以帮助您将可互操作的组件和第三方集成连接起来，从而简化 AI 应用程序的开发——同时还能随着底层技术的演进，确保您的决策能够面向未来。

# Python pip
$ pip install langchain

https://github.com/langchain-ai/langchain

# pip install -qU langchain "langchain[anthropic]"
from langchain.agents import create_agentdef get_weather(city: str) -> str:"""Get weather for a given city."""return f"It's always sunny in {city}!"agent = create_agent(model="claude-sonnet-4-5-20250929",tools=[get_weather],system_prompt="You are a helpful assistant",
)# Run the agent
agent.invoke({"messages": [{"role": "user", "content": "what is the weather in sf"}]}
)

https://docs.langchain.com/oss/python/langchain/overview

demos

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refs

https://www.langchain.com/

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