chatroom is a chat app of Uliweb. So it'll be used in Uliweb application. And this project shipped with some example projects, so you can run and test it.
Make sure you've already istalled the lastest version of Uliweb.
pip install gevent-socketio
cd chatroom/examples/simple
uliweb runserver --gevent-socketio or python gevent_socketio_handler.py
Visit: http://localhost:8000 (the former) or http://localhost (the later)