Google App Engine comes bundled with the popular Django python framework.

For an idea of Django hosting prices, visit http://www.webfaction.com/services/hosting.

Python hosting is rare and pricey (compared to PHP hosting).

Before  Google App Engine, if you wanted to run Django on Bluehost, you have to be ready to do quite a bit of work and bluehost tells you it is not supported.

Google App Engine gives a free start-up pack that comes with 500M disk space.

So, before you fork out $ for Django hosting,  give Google App Engine a spin first.