This is the Dulwich project.
It aims to provide an interface to git repos (both local and remote) that doesn't call out to git directly but instead uses pure Python.
The project is named after the part of London that Mr. and Mrs. Git live in in the particular Monty Python sketch.
The dulwich documentation can be found in doc/ and on the web:
The API reference can be generated using pydoctor, by running "make pydoctor", or on the web:
There is a #dulwich IRC channel on Freenode, and a dulwich mailing list at https://launchpad.net/~dulwich-users.