Arc Server Update User Roles using Python Script

Hello,

I am using Python Script (below) to create users and user roles and set permissions, and this works perfectly........

http://resources.arcgis.com/en/help/...000061s000000/

However if I try and update my user roles or permissions eg. change password or remove user privilages the above script doesn't allow me to do this. (It only allows me to create new users, new roles etc.)

Does anyone have a python script which can be added to the above script that allows me to update user permissions and roles?

Thanks,

Niall