Python audio output switch

[Pan Xingzhi]

Guys:

     Hi there. Recently I'll have to write a quite interesting program 
in Python on a Linux box. What I need is a function which allows the 
user to 'switch' the audio output from <an audio 
file>/<microphone>/<line in>.

     I'm not quite familiar with Linux programming. I've checked some 
python media frameworks but still need some light. Does anybody have 
experience on this? Thanks in advance!

     Regards,
                            Pan Xingzhi