If you haven’t been following Google App Engine Blog, according to latest post the Google App Engine is getting popularity and many programmers are learning python just to play with App Engine. According to Marzia Niccolai on Google App Engine Blog:
I’ve returned from the App Engine hack-a-thon in Chicago a Superfan of the App Engine community. We had lots of fun meeting App Engine developers, but why let me tell you about it? A couple of attendees wrote great summaries of the day: A Ruby on Rails developer giving Python a whirl, and a developer who worked on testing with App Engine. We saw people working on iPhone apps, OpenSocial and App Engine, and even a chat application!
So, if you want to host your application on reliable Google platform then you gotta learn Python to make your next app in Google App Engine. Google App Engine is going to be the next big thing if they started supporting rest of the languages like PHP, Ruby and Perl which they have already promised. So stay tuned.