So I saw this recently that QwertyQwerty88 made an extension starter awhile back for Python, using Py-Script, and I saw it using Flask. So I made an extension starter from that with just Flask. It has some prebuilt things for the HTML and includes pre-linked script.js and style.css. You would technically be able to use Python in it still while being able to styling things (making websites within it, or making a custom styled console, etc). I hope you enjoy!
If you have any suggestions or ideas please tell me! If you create anything with it I would love to see it, post it here or PM if you would like.
Made with 
by SalladShoter