[Baypiggies] how to IPC with python on linux?

[jim]

   how to implement IPC in Python on Linux? 
   There's a local open source group using python on 
fedora to create an app that looks like a classic 
threading problem: copying files has the effect of 
stalling until all files are written, and they'd 
like a progress bar. 
   They're interested in building separate processes 
rather than get into threading, and after a brief 
unproductive hunt in the os and sys modules, i 
figured some of you all would have not only answers 
but maybe best practices for writing python programs 
on the linux OS that can use InterProcess Communication 
to work together. 
   hopefully, 
jim