Well, you are going to have to gainroot before launching the python script; if the python script is launched with root privs, then it should work.
Try:
sudo gainroot
python myscript.py


edit:
Then, if you need to be able to launch it from a non-root terminal; something you can't run "sudo gainroot" from first, you will need to
add:
ALL ALL= NOPASSWD: /path/to/python /path/to/myscript.py

to the sudoers file. Then you can run "sudo python /path/to/myscript.py" with root privs, without having to enter your password.