报错

使用langchain时，import langchain时报错内容如下：

pydantic.errors.PydanticUserError: If you use `@root_validator` with pre=False (the default) you MUST specify `skip_on_failure=True`. Note that `@root_validator` is deprecated and should be replaced with `@model_validator`.
 
For further information visit https://errors.pydantic.dev/2.7/u/root-validator-pre-skip

解决

pydantic的版本问题，将pydantic库的版本降低到1.10.13，pydantic_core等相关依赖库的版本也会自动降低。

pip install pydantic==1.10.13 -i  https://pypi.tuna.tsinghua.edu.cn/simple