Python process communication

[projects.gg.aaron at gmail.com]

Hi,
I'd like to write a script that will connect to another already running 
process, pipe some data to it's input and receive data from it's output. I can 
create another process using subprocess module, but how do I connect to 
already running process? Maybe there is a better solution for process 
communication? I've searched in the net and found nothing, so I've decided to 
post my problem here, hopefully someone will help me.

Thanks in advance
Marek Aaron Sapota
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