Jupyter Book-inspired nbconvert template to add toggle button to hide / display code cells. See subsection Hiding code blocks or entire cells.
To use the template, run:
jupyter nbconvert notebook_to_convert.ipynb --to slides [OPTIONS] --template=hide_cell.tpl
The code cells tagged hidecode will be hidden. A toggle button will appear on the right to display / hide the given code cell.
Note: only run code cells will be hidden. If you want to remove this behaviour, you will have to remove the condition cell.execution_count is not none.