virtualenv lang_env # 创建虚拟环境
source lang_env/Scripts/activate //windows
pip install langgraph -i https://pypi.tuna.tsinghua.edu.cn/simple (清华镜像) 0.4.8 / 1.1.6
pip install langchain-openai python-dotenv -i https://pypi.tuna.tsinghua.edu.cn/simple # 可以不安装langchain
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