Where is a good open source python project to be used as example?

[Andrea Francia]

I'm looking for a python project to use as example to learning python.

The project should have these features:

    1. is almost fully unit tested
    2. use consistently the code convention recommended by PEP 8
    3. it's elements are almost fully documented

Extra point features are:

    4. building, assembling, and release automation

Did you know where are such projects?