You are very welcome to contribute to the project! The bugtracker, wiki and mercurial repository can be found at the project’s page.
New releases are also published at the cheeseshop.
There are various possibilities to get involved, for example you can:
To run the tests, just type the following on a terminal:
$ cd /path/to/polib/
$ ./runtests.sh
If you want to generate coverage information:
$ pip install coverage
$ ./runtests.sh
$ coverage html