Kernel not found with venvs (jupyter_client.kernelspec.NoSuchKernel) about papermill HOT 2 CLOSED

So you somewhat hit on the right place to look for a solution. Basically papermill is running as a library below any virtual boundaries, so it's a dumb client in the fact that it implies no environment manipulation. It does this because when used as an imported library the intention is to be using the environment the current process has established and not to manipulate that processes intentions. Basically papermill has no knowledge of jupyter server, which might be doing fancier environment management. Becoming aware of higher order organizations makes the client overly complicated and brittle to upstream changes.

I usually recommend explicitly activating the virtualenv you wish to use before calling papermill so there's no confusion. In more complicated scenerios, setting env variables to override defaults (which is exactly how env activation works as well) can work. Some groups also make small wrapper CLIs to do custom setups for this purpose (e.g. {myorgname}-papermill) to add any business logic in a way that's explicit to follow but doesn't require daily users to have to remember.

Hope that helps

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Hi Matthew

Thanks for the reply and explainations. I reformulated my original question a bit so it can at least be used as search target if somebody encounters the same issue.

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