Connecting to Firebase from Python Google App Engine
The python firebase by default uses the multiprocessing package for threading. By default, AppEngine blocks all multiprocessing calls. AppEngine does its own form of multiprocessing by creating task queues and spinning up other instances of your application upon load.
I've created a python-firebase-gae package to deal with this issue.
There is now a python-firebase-gae project which is based on URL Fetch and does not depend on any restricted packages.