Python doesn't see packages with Jupyter Notebook

Question

I use Jupyter Notebook with a virtual environment. I have a dependency installed, but can't import it:

cell 1:
!pip3 install sent2vec

Requirement already satisfied: sent2vec in 
venv/lib/python3.7/site-packages (0.0.0)

cell 2:
import sent2vec

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-5-06231d291a17> in <module>
----> 1 import sent2vec

ModuleNotFoundError: No module named 'sent2vec'

How this can happen? How to fix this?

> pip3 list
Package      Version  
------------ ---------
certifi      2019.9.11
chardet      3.0.4    
Cython       0.29.14  
idna         2.8      
joblib       0.14.0   
langdetect   1.0.7    
nltk         3.4.4    
numpy        1.17.1   
pip          19.3.1   
requests     2.22.0   
scikit-learn 0.21.3   
scipy        1.3.2    
sent2vec     0.0.0    
setuptools   41.6.0   
six          1.13.0   
urllib3      1.25.7   
wheel        0.33.6

Answer 1

You'll note that jupyter is not listed in your installed packages. That means you're running it from a different virtual environment. As I mentioned in the comment responding to your question, you can run which jupyter to find out where your Jupyter Notebook application is being run from (assuming you're on a *NIX system); in this case, it won't be from the python3.7 virtual environment that shows up in your first code block.

To resolve the issue, you simply need to run pip3 install jupyter , then retry running jupyter notebook .

Alternatively, you can add your virtual environment as a kernel so that it can be selected when you're running Jupyter from your original environment. To do this, you would run (assuming pip is connected to your original environment):

pip install ipykernel
ipython kernel install --user --name=<insert name of your venv>

You should then be able to select that venv as a kernel on new notebooks. (Source for info on venv activation in Jupyter).

Answer 2

It apears that you need Numpy 1.17.1 (you have Numpy 1.16.0 ) to use sent2vec

requirements https://github.com/epfml/sent2vec/blob/master/requirements.txt

Answer 3

Run this (with envname your enviroment name):

jupyter kernelspec uninstall envname

ipython kernel install --user --name=envname

Sometimes Jupyter doesnt update properly the kernels associated with enviroments. So the solution is to uninstall it and install it again.

I had the same problem and this fixed it

Answer 4

Try by installing directly within Jupyter using the following command:

import sys
!{sys.executable} -m pip install your_package_name