What Python framework do you use under Google App Engine?

Question

Python

Please share your experience in using Python frameworks for Google App Engine. More inclined towards micro-frameworks, but I will listen to all opinions, all pros and cons.
It would also be interesting to know the choice of template engine with which you use the framework.

I propose to give answers in the format:
1) Framework
2) Template engine
3) All “for” (what do you like, what makes it better than others?)
4) All “against” (what you don’t like, what makes it worse than others?)

Answer 1

Right now I'm using
1. web.py
2. Jang's templating engine
3. Out of the box, simple as a board
4. Simplicity is also a minus. There are not enough wrappers, shortcuts and other things. In general, it somehow turns out verbose on it
. Quite popular, judging by the blogs, tipfy (http://tipfy.org). I want to try it soon. Seems to be fast and easy too. With authorizations, sessions, and the Jinja2 template engine and a bunch of other things.

Answer 2

So far I have settled on:
1) Flask (Werkzeug)
2) Jinja 2
3) Flexibility, the ability to use knowledge of Flask outside of GAE
4) It loses a bit in speed and some features relative to tipfy, since the latter is sharpened specifically for GAE