ModuleNotFoundError: 找不到模块名 ‘langchain’

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英文:

Langchain: ModuleNotFoundError: No module named 'langchain'

问题

当我在VS Code中编写代码时,以以下方式开始:

import os
from langchain.chains import RetrievalQA
from langchain.llms import OpenAI
from langchain.document_loaders import TextLoader

我遇到了错误:ModuleNotFoundError: No module named 'langchain'

我已经将Python升级到版本3.11.4,更新了pip,并重新安装了langchain。我还检查了sys.path和包含Langchain文件夹的文件夹C:\\Python311\\Lib\\site-packages被附加了。

编辑:当我在Python控制台中运行时,Langchain导入有效(功能也有效),但当我从VSCode运行按钮运行代码时仍然会提供ModuleNotFoundError。

是否有其他人遇到过这个问题并找到了解决方案?

英文:

When I write code in VS Code, beginning with:

import os
from langchain.chains import RetrievalQA
from langchain.llms import OpenAI
from langchain.document_loaders import TextLoader

I am met with the error: ModuleNotFoundError: No module named 'langchain'

I have updated my Python to version 3.11.4, have updated pip, and reinstalled langchain. I have also checked sys.path and the folder C:\\Python311\\Lib\\site-packages in which the Langchain folder is, is appended.

EDIT: Langchain import works when I run it in the Python console (functionality works too), but when I run the code from the VSCode run button it still provides the ModuleNotFoundError.

Has anyone else run into this issue and found a solution?

答案1

得分: 1

为将来参考,我相当确信这个错误是由于pip在错误的目录中安装文件引起的。确保目标目录与您的sys.path文件夹所在的位置相符,因为有时它们可能会有所不同!感谢所有提供建议的人。

英文:

For future reference, I'm fairly sure this error was caused by pip installing files in the incorrect directory. Make sure the target directory is where your sys.path folder is, as sometimes these can vary! Thanks to everyone who provided advice.

答案2

得分: 1

我曾使用Python 3.9.7安装了包,但这个版本引发了问题,所以我切换到了Python 3.10。当我安装langchain时,它位于python 3.9.7目录中。如果你运行pip show langchain,你会得到以下信息:

名称:langchain
版本:0.0.220
摘要:通过可组合性构建具有LLMs的应用程序
主页:https://www.github.com/hwchase17/langchain
作者:
作者电子邮件:
许可证:MIT
位置:/home/anaconda3/lib/python3.9/site-packages
需要:aiohttp,async-timeout,dataclasses-json,langchainplus-sdk,numexpr,numpy,openapi-schema-pydantic,pydantic,PyYAML,requests,SQLAlchemy,tenacity
依赖于:jupyter_ai,jupyter_ai_magics

如果你看位置属性,你会看到/home/anaconda3/lib/python3.9/site-packages。但由于我正在使用Python 3.10,我必须确保langchain位于Python 3.10的目录中,所以我使用以下命令安装了langchain

python3.10 -m pip install langchain

现在当我运行python3.10 -m pip show langchain时,我得到以下信息:

名称:langchain
版本:0.0.264
摘要:通过可组合性构建具有LLMs的应用程序
主页:https://www.github.com/hwchase17/langchain
作者:
作者电子邮件:
许可证:MIT
位置:/home/.local/lib/python3.10/site-packages
需要:aiohttp,async-timeout,dataclasses-json,langsmith,numexpr,numpy,openapi-schema-pydantic,pydantic,PyYAML,requests,SQLAlchemy,tenacity
依赖于:

现在新的位置指的是Python 3.10目录。

英文:

I had installed packages with python 3.9.7 but this version was causing issues so I switched to Python 3.10. When I installed the langhcain it was in python 3.9.7 directory. If yo run pip show langchain, you get this

Name: langchain
Version: 0.0.220
Summary: Building applications with LLMs through composability
Home-page: https://www.github.com/hwchase17/langchain
Author: 
Author-email: 
License: MIT
Location: /home/anaconda3/lib/python3.9/site-packages
Requires: aiohttp, async-timeout, dataclasses-json, langchainplus-sdk, numexpr, numpy, openapi-schema-pydantic, pydantic, PyYAML, requests, SQLAlchemy, tenacity
Required-by: jupyter_ai, jupyter_ai_magics

If you look at the Location property, you see this /home/anaconda3/lib/python3.9/site-packages. But since I am using Pyhton3.10 I had to make sure langchain is in the directory of Python 3.10. so installed the langhchain with

python3.10 -m pip install langchain   

now when I run, python3.10 -m pip show langchain I get this

Name: langchain
Version: 0.0.264
Summary: Building applications with LLMs through composability
Home-page: https://www.github.com/hwchase17/langchain
Author: 
Author-email: 
License: MIT
Location: /home/.local/lib/python3.10/site-packages
Requires: aiohttp, async-timeout, dataclasses-json, langsmith, numexpr, numpy, openapi-schema-pydantic, pydantic, PyYAML, requests, SQLAlchemy, tenacity
Required-by: 

Now new Location is referring to Python3.10 directory

答案3

得分: 0

你可能没有将你的Python文件位置添加到环境变量中。

复制你的Python文件位置
转到搜索>编辑环境变量>用户变量>Path>新建
将复制的Python位置放入用户变量中。
然后再试一次!

英文:

you probably didn't put your python file location into the enviroment variables.

copy your python file location
go to search>edit enviroment enviroment variables>user variables>path>new
put the copied python location in the user variables.
then try again!

答案4

得分: 0

在安装时,请尝试使用:
python -m pip install langchain

英文:

when installing in your environment try using:
python -m pip install langchain

答案5

得分: 0

请检查在VS窗口右下角的Python版本,如果您在VS中运行代码,并且有多个Python版本。

英文:

If you are running the code in VS and you have more than one Python version, please check if the bottom right side of the VS Window the version of Python you are using.

答案6

得分: 0

已通过首先创建虚拟环境,然后安装 langchain 来解决了这个问题。

在VSCode中打开一个空文件夹,然后在终端中执行以下步骤:

  1. 创建一个新的虚拟环境,命令是 python -m venv myvirtenv,其中 myvirtenv 是你的虚拟环境的名称。

  2. 在终端中输入 myvirtenv/Scripts/activate 以激活你的虚拟环境。(如果这不起作用,请输入 cd .\myvirtenv\Scripts 并按回车,然后输入 ./activate 并按回车,然后输入 cd ../.. )。现在你的虚拟环境应该在VSCode中被激活。

  3. 输入 pip install langchain 并按回车。

英文:

Solved the issue by creating a virtual environment first and then installing langchain.

Open an empty folder in VSCode then in terminal:

  1. Create a new virtual environment python -m venv myvirtenv where myvirtenv is the name of your virtual environment.

  2. In terminal type myvirtenv/Scripts/activate to activate your virtual environment. (If this does not work then type cd .\myvirtenv\Scripts and hit enter, type ./activate hit enter and then type cd ../.. ) . Now your virtual environment should be activated in VScode.

  3. Type pip install langchain and hit enter.

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  • 本文由 发表于 2023年7月20日 11:05:14
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