Stream Framework is a Python library, which allows you to build news feed, activity streams and notification systems using Cassandra and/or Redis. The authors of Stream-Framework also provide a cloud service for feed technology:
reddit's python service framework
The Django REST framework tutorial.
Python service microframework
A familiar HTTP Service Framework for Python.
Web APIs for Django.
JSON API support for Django REST Framework
Websauna is a full stack Python web framework for building web services and back offices with admin interface and sign up process