How to use Python 3.3 in web apps ?

Apparently PythonAnywhere uses the Python 2.7 for web apps by default (based on my error log). Is there any possible way to make it 3.3 ?

Not currently - see this thread.

I'm beginning to think this might be worth its own FAQ entry, since this is the second time it's been asked in a few days. With the release of Django 1.5 a week ago that supports Python 3, I'm guessing we'll finally start to see some momentum building up over the next year or so.

Agreed, we'll add it to the FAQ and upvote support for it on the to-do list.