This would be using something like Brython on the client-side: http://brython.info

The idea is that you would have a full stack web framework that shared as much code as possible between the client and server. The client-side Python would then be compiled into JavaScript using Brython or similar. Include first-class support for web sockets. I would also like an API similar in feel to something like PySide/PyQT.

Is there already a web framework using Python on the client-side? If so, I haven't found it yet. Thinking of starting a project like this and want to gauge interest.

Brython's performance doesn't seem that bad: https://brythonista.wordpress.com/2015/03/28/comparing-the-s...

And Brython supports dynamic loading of modules, so you don't need the entire ~2MB stdlib at load. Where Brython falls short for me is CLI tooling. I would like to be able to just point a CLI tool at my source directory and have it compiled into JS with all the stdlib modules used included. Brython supports pre-compilation, so the only thing missing is the CLI tools.