Apache Libcloud is a standard Python library that abstracts away differences among multiple cloud provider APIs
http://libcloud.apache.org/

Pinax is an open-source platform built on the Django Web Framework. By integrating numerous reusable Django apps and providing starter projects and infrastructure tools, Pinax takes care of the things that many sites have in common so you can focus on what makes your site different. Pinax has been used for everything from social networks to conference websites, and from intranets to online games.
http://pinaxproject.com/