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iirc, a few years back I was able to do all of these things with the Papermill IPython runtime.

Papermill is great, but yes: lots of room to hack on it and make it better.

has papermill deprecated the ipython runtime? I used papermill extensively in the past and I never saw that in their docs.

It’s been a while but you do it with a custom kernel and maybe some entry point tweaks. IIRC.