title: code generation in setup.py
body: <p>I've got some XML files from which I intend to derive some python source code; they are things like lists of language codes. Does the distribute module have a hook I can plug into for this purpose? To be perhaps clearer, I don't want to ship XML around. I want to only ship .py files. I want to derive some .py files by running a program that generates them from XML.</p>