[Python] How to make a 5.1 and a 7.1 surround sound file

I'm trying to make/create a 5.1 and a 7.1 surround sound file but I'm having trouble finding a way to do it. I'm using ubuntu 12.04 and I have access to octave / matlab / python. I understand how to create an audio file in octave / matlab / python but not sure how to create the proper file format for a 5.1 and 7.1 surround file.

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