How can I read .ARC files from a Heritrix crawler using Python?

I looked at the Heritrix documentation website and they listed a Python .ARC file reader. However, when I clicked on it, it was not found. http://crawler.archive.org/articles/developer_manual/arcs.html

Does anyone else know of any Heritrix ARC reader that uses Python?

(I asked this question before, but closed it due to inaccuracy)