I more or less know how to use select() to take a list of sockets, and only return the ones that are ready to read/write something.  The project I'm working on now has a class called 'user'.  Each 'user' object contains its own socket.  What I would like to do is pass a list of users to a select(), and get back a list of only the users where user.socket is ready to read/write.  Any thoughts on where to start on this?
Edit:  Changed switch() to select().  I need to proofread better.
You should have your User class implement a fileno(self) method which returns self.thesocket.fileno() -- that's the way to make select work on your own classes (sockets only on windows, arbitrary files on Unix-like systems).  Not sure what switch is supposed to me -- don't recognize it as a standard library (or built-in) Python concept...?
Creating waitable objects in Python