Django works just fine. If you want to build your own framework (e.g. use Bottle) then go for it. Waste [Invest?] the time while the rest of us are busy getting things done.
I don't think that you can compare ANY Python framework (or any framework in any language) with Ruby on Rails. If you write Ruby, use RoR. If you write Python, don't use RoR.
Also, for anyone recommending something like Tornado, please stop. It's NOT THE SAME THING and completely off topic. If you want something micro for a small concise project use Flask.
I tried to use Flask for a GAE project a few months ago. I stopped two views later, when I realized I'd started reinventing half of Django. I switched to Django for GAE at that point, and I'm very happy so far.
I don't think that you can compare ANY Python framework (or any framework in any language) with Ruby on Rails. If you write Ruby, use RoR. If you write Python, don't use RoR.
Also, for anyone recommending something like Tornado, please stop. It's NOT THE SAME THING and completely off topic. If you want something micro for a small concise project use Flask.