Differences between webapp and web.py

Question

Webpy.org - Who uses web.py?

"[web.py inspired the] web framework we use at FriendFeed [and] the webapp framework that ships with App Engine..."
— Brett Taylor, co-founder of FriendFeed and original tech lead on Google App Engine

Google App Engine Getting Started for Python

HTML embedded in code is messy and difficult to maintain. It's better to use a templating system... ...For your convenience, the webapp module includes Django's templating engine

Questions:
What are the differences between webapp and webpy?
Is it worth the trouble to bundle webpy when Appengine already offers webapp?

What I know:
1. Web.py has a templating language of it's own(it looks easier than Django's)
2. Currently, the only reason for which I am thinking about using web.py is to avoid using(and learning) Django for templating on appengine.
3. The quotes at the head of this question
4. I have been through related questions and through the webapp documentation on Google.
5. I have noticed that stackprinter uses web.py and is hosted on appengine.

Answer 1

web.py experience:
I started to use web.py three years ago when I decided to learn some Python web frameworks.
The first thing I loved of web.py was its simplicity; I was searching for an essential microframework without all the batteries that you can find in other bigger projects like Django or Web2py for example.

So I developed a couple of projects (deployed with fastcgi) and learned all of the web.py library features, Templetor included.

Then I discovered Google App Engine and started to use Webapp; it was a boring process because instead of using python (like Templetor or Mako), it forces you to learn a new templating syntax that it is very restrictive by default.
While Developing StackPrinter I found that Google App Engine was supported by web.py so I removed Sqlite, made some minor tweaks and started to use GAE datastore.

Web.py was my first love in term of Python web frameworks and it's fair to say that I'm a little biased to talk about it.
I'm sticking with web.py for my pet-project on GAE because I'm fluent with it and templetor is lightning fast.
I like the fact that I can use Python for templating and the easy way to share some data or functions globally to the views, I like also the rich toolset of utilities for encoding, markdown and so on.

Webapp vs web.py:
I think it's not fair to compare them because Webapp is a simple framework that just provides the minimum easy tools to get started; many features are missing like I18n, validation, processors or even the basic cookies handling.
Check Webapp-improved for something better.

My recommendation:
If your focus is mainly on developing for Google App Engine, I would recommend you to go with some framework made specifically for GAE like Tipfy.
If you are searching for a pythonic web framework to play with on your side-projects, web.py is a good project to study and to follow.