一、安装langchain

代码报错：

ModuleNotFoundError: No module named 'langchain'

(aid) C:\Users\admin>pip install langchain (最新版本是1.0.1)

代码报错

ModuleNotFoundError: No module named 'langchain.chains'

(aid) C:\Users\admin>pip install langchain.chains
ERROR: Could not find a version that satisfies the requirement langchain.chains (from versions: none)
ERROR: No matching distribution found for langchain.chains

二、尝试langchain降级

pip uninstall langchain

(aid) C:\Users\admin>pip install langchain==0.3.27
https://github.com/langchain-ai/langchain/tags?after=langchain-openai%3D%3D0.4.0.dev0

(aid) C:\Users\admin>pip install langchain-community==0.3.22
https://github.com/langchain-ai/langchain/tags?after=langchain-core%3D%3D0.3.58