Can I somehow change the setup.py script such that I can create a new set of (group, user) with specific privileges only needed for installation and uninstallation.

Once a new set of (group, user) is created, I can always do 

os.setgid(gid) and os.setuid(uid)

But, I can't figure out how to change setup.py to create a new set of permissions during installation. It should be possible because at time of installation setup.py runs with sudo privileges.