paths (Newbee question)

[Joseph C. Slater]

I'm trying to use os.popen to run ps2pdf on a file. This works fine, as 
long as p2pdf is in the path, along with all of the other things it 
needs. To make a long story short, how do I, inside python, not in the 
call, set these paths?

I'm expecting this is pretty easy. Problem being, after applying that 
required 4 hours, I'm not finding it.
Thanks,
Joe
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http://www.cs.wright.edu/~jslater