Update cheatsheets

jupytext

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# jupytext
+
+> Convert Jupyter notebooks to plain text documents, and back again.
+> More information: <https://jupytext.readthedocs.io>.
+
+- Turn a notebook into a paired `.ipynb`/`.py` notebook:
+
+`jupytext --set-formats ipynb,py {{notebook.ipynb}}`
+
+- Convert a notebook to a `.py` file:
+
+`jupytext --to py {{notebook.ipynb}}`
+
+- Convert a `.py` file to a notebook with no outputs:
+
+`jupytext --to notebook {{notebook.py}}`
+
+- Convert a `.md` file to a notebook and run it:
+
+`jupytext --to notebook --execute {{notebook.md}}`
+
+- Update the input cells in a notebook and preserve outputs and metadata:
+
+`jupytext --update --to notebook {{notebook.py}}`
+
+- Update all paired representations of a notebook:
+
+`jupytext --sync {{notebook.ipynb}}`