I wrote this plugin for Neovim to be able to edit Jupyter notebook .ipynb files directly in Neovim. The native format for notebooks is quasi-binary json. This plugin uses the jupytext tool (<a href="https://github.com/mwouts/jupytext">https://github.com/mwouts/jupytext</a>) to convert that json to a plain text representation (markdown or code) on the fly, and back to json when the file is saved.