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I created a virtual environment and installed ipython[all] and jupyter with pip. When I run jupyter lab, open a notebook, and try importing a package I installed inside the virtual environment, I get “ModuleNotFoundError.”

Running ipython in the console and importing works. Also, which jupyter does point me to the right executable in the virtual environment.

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3 Answers 3

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The issue comes from the fact that your environment is not registered in the kernelspec. You can activate your venv, run

python -m ipykernel install --user --name=some_nice_name

and then select the kernel some_nice_name for your notebook (you can use the kernel even if you run jupyter lab from another venv ; keep in mind that the python running jupyter lab and the kernel are in general different)

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In addition to installing jupyter, I need to install jupyter lab. Otherwise, even the virtual environment jupyter executable actually silently falls back to the system Jupyter Lab installation.

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install jupyter lab in the virtual env:

pip install jupyterlab
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This is actually a bad idea. If you have 5 virtual environments, you would install jupyter lab in each one? The purpose for jupyter is having an interactive environment to execute code. Each virtual environment will be dedicated for a specific purpose (image processting, NLP, deep learning, etc)

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