After all, the site's intro clearly states, "You're knee deep in learning the Python programming language...Now you want to take your initial Python knowledge and make something real. A real web application that's available on the web"
This is just plain wrong to force someone with your new hype and vague idea of how a web application should be developed using only your new hipster framework of choice and nothing else.
There are tons of way you can write a web application, that's why open source is cool, chose the one that pleases you and have fun with it, but stop trying to prevent others using anything else but what you judge to be the best.
I have strong opinion (you might disagree with me) that Javascript should stay in the browser, like it was designed for, and inherited to browsers to this very day.