No module named 'langchain'

[kingikongo]

hello guys i have installed langchain (0.0.157) and python (3.10 something like that), i even tried to change versions of lang and py but still get this error, which makes me think that the root the problem is not versions of lang and py. SOS!

[oddrationale]

My guess is that you may not have langchain installed in the same environment as your Jupyter Notebook. Try running

!pip list

in a Notebook cell and see if langchain is listed. If not, try running:

!pip install -U langchain

Also, you have a typo:

from langchain.llms import ...

[oddrationale]

Don't worry. Managing many python environments can get confusing.

Yes, looks like langchain is not installed in the same environment as your Jupyter notebook. One way to fix this is to run

!pip install -U langchain

directly from a notebook cell. That will ensure that langchain is installed together with your Jupyter notebook. Assuming, of course, this is the environment you want to have langchain installed.

[kingikongo]

!pip install -U langchain

um...

[kingikongo]

Responding to your comment from #4158.

Is -U replaced with anything else ?
also how can i check if langchain and jupyter or python are in same environment?

From your notebook cell, run !pip list. Do you see langchain listed when you do this? You can past the output or screenshot here.

oh, thanks for your help, i have activated environment and installed ipykernel so now langchain i shown as imported. thanks again!

[wyz9616]

sos, i have the same question!! i installed ipykernel but i still can't run it

i have already installed langchain definitely!

[eneyi]

Maybe a bit late, but I created a virtual environment for my project and installed jupyter and langchain in that virtual environment

sudo python -m venv .venv
source .venv/bin/activate
pip install jupyter[all] openai langchain
jupyter notebook

And this should work now