Can you convince your sysadmin to install the 3 or 4 requirements on your system (python-yaml, python-paramiko, and python-jinja2)?
If you do, then you do not need to run setup.py. Running the following should be sufficient:
export ANSIBLE_HOSTS=/a/b/c/ansible_hosts
. ansible/hacking/env-setup
Note that one site I use ansible at, I use it as an apps user, not as root.