Trouble importing langchain

[justinliu03]

Recently, I've been having trouble importing langchain. It gives me the error "TypeError: issubclass() arg 1 must be a class," even though I have been previously using langchain imports without a problem. Did something change regarding the libraries?

[justinliu03]

I am now getting the following error
ImportError: cannot import name 'get_callback_manager' from 'langchain.callbacks' (C:\Users\liu_s\miniconda3\lib\site-packages\langchain\callbacks_init_.py)

[dosubot[bot]]

Answer generated by a 🤖

Answer

Hello,

The error "TypeError: issubclass() arg 1 must be a class" usually occurs when you're trying to use a module or a function as a class. In this case, it might be related to the import of 'get_callback_manager' from 'langchain.callbacks'.

From the information you've provided, it appears that 'get_callback_manager' is not defined in 'langchain.callbacks'. The 'ImportError: cannot import name 'get_callback_manager' from 'langchain.callbacks'' error suggests that 'get_callback_manager' might not exist in 'langchain.callbacks' or there might be a circular import issue.

You might be trying to import a function that doesn't exist or has been renamed or removed. Please check your code and ensure that 'get_callback_manager' is defined in 'langchain.callbacks' and is correctly imported.

Here are some similar issues that have been solved:

1. LangChain 0.0.250 circular import bug, possibly LangSmith related which was last updated on August 03, 2023
2. Issue: Can not import the Langchain modules. which was last updated on July 27, 2023
3. TypeError: issubclass() arg 1 must be a class when using langchain in azure which was last updated on July 12, 2023

Also, could you please provide the exact version of LangChain you are currently using? This will help me to better understand the issue.

Best,
Dosu

Sources

• libs/langchain/langchain/callbacks/context_callback.py
• libs/langchain/langchain/callbacks/init.py

---

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Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

[justinliu03]

I am using Langchain version 0.0.150. Any import with langchain doesn't work for me, including the rudimentary "import langchain"

…

On Fri, Aug 4, 2023 at 1:57 PM dosu-beta[bot] ***@***.***> wrote: *Answer generated by a 🤖* Answer Hello, The error "TypeError: issubclass() arg 1 must be a class" usually occurs when you're trying to use a module or a function as a class. In this case, it might be related to the import of 'get_callback_manager' from 'langchain.callbacks'. From the information you've provided, it appears that 'get_callback_manager' is not defined in 'langchain.callbacks'. The 'ImportError: cannot import name 'get_callback_manager' from 'langchain.callbacks'' error suggests that 'get_callback_manager' might not exist in 'langchain.callbacks' or there might be a circular import issue. You might be trying to import a function that doesn't exist or has been renamed or removed. Please check your code and ensure that 'get_callback_manager' is defined in 'langchain.callbacks' and is correctly imported. Here are some similar issues that have been solved: 1. LangChain 0.0.250 circular import bug, possibly LangSmith related <#8680> which was last updated on August 03, 2023 2. Issue: Can not import the Langchain modules. <#7131> which was last updated on July 27, 2023 3. TypeError: issubclass() arg 1 must be a class when using langchain in azure <#7548> which was last updated on July 12, 2023 Also, could you please provide the exact version of LangChain you are currently using? This will help me to better understand the issue. Best, Dosu Sources - libs/langchain/langchain/callbacks/context_callback.py <https://github.com/langchain-ai/langchain/blob/-/libs/langchain/langchain/callbacks/context_callback.py> - libs/langchain/langchain/callbacks/*init*.py <https://github.com/langchain-ai/langchain/blob/-/libs/langchain/langchain/callbacks/__init__.py> ------------------------------ This response is meant to be useful, save you time, and share context. It is *not meant to be a precise solution*, but rather a starting point for your own research. Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant. — Reply to this email directly, view it on GitHub <#8768 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BARSEU6YOQFWCUIONVKHBV3XTUZZRANCNFSM6AAAAAA3EPWA2U> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[devstein]

@justinliu03 what's your Pydantic version? Might be related to #7458