Pyramidongae is a project mainly written in Python, it's free.
A simple demonstration of using Pyramid on Google App Engine.
This project demonstrates how to use Buildout to set up a sane development environment for developing and deploying Pyramid apps on Google App Engine.
See http://docs.pylonsproject.org/projects/pyramid/1.0/index.html for information about Pyramid.
See http://www.buildout.org/ for information on Buildout.
This app is one of the simplest possible, serving up 'Hello, World!' at '/', and 'Goodbye, World!' at '/goodbye'.
Build and run the application::
$ python2.5 bootstrap.py --distribute $ ./bin/buildout $ ./bin/dev_appserver parts/pyramidongae
Then access the application using a web browser with the following URL::
http://localhost:8080/
To upload application files, run::
$ ./bin/appcfg update parts/pyramidongae
For a more detailed documentation follow this url::
http://code.google.com/appengine/docs/python/tools/uploadinganapp.html