Pyodide [1] (Python in the browser) is available for writing interactive books like never before. You can let the user not just play with pre-built visualizations but actually modify the code as they see fit - the important thing being that python is easier to parse than javascript.

I am writing an interactive book in this fashion these days, and I am hoping it will help my readers build understanding that is much deeper than the existing static books and resources.

[1] https://pyodide.org/en/stable/

Previous discussions:

* https://news.ycombinator.com/item?id=24197528 (326 points | Aug 18, 2020 | 89 comments)

* https://news.ycombinator.com/item?id=21039848 (443 points | Sept 22, 2019 | 132 comments)

* https://news.ycombinator.com/item?id=12042548 (456 points | July 6, 2016 | 44 comments)

* https://news.ycombinator.com/item?id=8019346 (329 points | July 11, 2014 | 65 comments)

* https://news.ycombinator.com/item?id=6978274 (108 points | Dec 29, 2013 | 19 comments)

On mobile I see a book with illustrations. Where is the "play"?

Really impressive demonstrations!