WIP: Observable as a Jupyter kernel frontend

The New notebooks in Quickstart thread reminded me of a test notebook I made of using an Observable notebook as a frontend to the python Jupyter kernel. It’s still incomplete, but since I don’t foresee myself finishing it in the near future :cry: I figured it would be better to share instead of just letting it rot in my private notebooks:

Questions, comments, forks, suggestions, etc. are all very welcome.

What’s missing: