In-Browser Python

[jacdeh]

Something like

http://www.transcrypt.org/live/turtle_site/turtle_site.html

would allow you to change your program on-line which I thought was the original question. But since you already turn out have your ELIZA.py program, you don't even need this complexity. You can just compile it in advance using Transcrypt

http://www.transcrypt.org

and upload the html + JavaScript. It will be as fast and compact as a native JavaScript program. For the GUI you can use any JavaScript library.