# langchain

**Repository Path**: power9508/langchain

## Basic Information

- **Project Name**: langchain
- **Description**: Langchain 笔记
- **Primary Language**: Python
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2025-03-17
- **Last Updated**: 2025-03-17

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

```shell
conda env list
conda create --name langchain python=3.12
conda activate langchain
conda remove --name langchainxx --all
pip install python-dotenv
# pip install langchain
# pip install langchain-openai
pip install "langchain[openai]"

```

# LCEL 

有点类似 await vs promise.then

```python
# 新语法
chain = prompt | ChatOpenAI() | StrOutputParser()
result = chain.invoke({"adjective": "funny"})

# 老语法
from langchain.chains import LLMChain
chain = LLMChain(llm=ChatOpenAI(), prompt=prompt, output_parser=StrOutputParser())
result = chain.run(adjective="funny")

```