安装使用LangChain时的报错解决_pydantic.errors.pydanticusererror: a non-annotated

刚刚装了LangChain但是引入各种包都报错，原因貌似为 Python3.7 不支持 LangChain，需要开启一个新的Python3.10环境，再重新安装即可正常运行。

创建新的python环境

conda create -n new_env python==3.10

重新安装

pip install langchain

这是当时的报错信息，写出来希望小伙伴来避避坑

 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\__init__.py", line 8, in <module>
   from langchain.agents import MRKLChain, ReActChain, SelfAskWithSearchChain
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\agents\__init__.py", line 2, in <module>
   from langchain.agents.agent import Agent
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\agents\agent.py", line 10, in <module>
   from langchain.chains.base import Chain
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\chains\__init__.py", line 2, in <module>
   from langchain.chains.conversation.base import ConversationChain
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\chains\conversation\base.py", line 7, in <module>
   from langchain.chains.conversation.memory import ConversationBufferMemory
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\chains\conversation\memory.py", line 7, in <module>
   from langchain.chains.conversation.prompt import SUMMARY_PROMPT
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\chains\conversation\prompt.py", line 2, in <module>
   from langchain.prompts.prompt import PromptTemplate
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\prompts\__init__.py", line 2, in <module>
   from langchain.prompts.base import BasePromptTemplate
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\prompts\base.py", line 35, in <module>
   class BasePromptTemplate(BaseModel, ABC):
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\langchain\prompts\base.py", line 41, in BasePromptTemplate
   @root_validator()
 File "E:\ProgramData\miniconda3\envs\common\lib\site-packages\pydantic\deprecated\class_validators.py", line 231, in root_validator
   code='root-validator-pre-skip',
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/2.0.3/u/root-validator-pre-skip

Process finished with exit code 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27