Failed to start the Kernel - Jupyter in VS Code

Question

I am trying to use a Jupyter notebook for some Pandas in VS Code. I set up a virtual environment venv where I installed Pandas and jupyter. I always did it like this and it worked fine. But suddenly it does not work anymore.

Answer 1

I got the same error message because the jupyter package was missing in my selected environment.

pip install jupyter

resolved the problem for me.

From the official VS Code documentation:

To work with Python in Jupyter Notebooks, you must activate an Anaconda environment in VS Code, or another Python environment in which you've installed the Jupyter package.

Answer 2

Could you try to reinstall the pyzmq module?

pip uninstall pyzmq
pip install pyzmq==19.0.2  

The version number may be different depending on the jupyter-client version.