There isn't really very much here beyond syntax examples, but to run those, first install RethinkDB (maybe using these very easy instructions), and then do this:
git clone https://github.com/lethain/rethinkdb-extraction.git cd rethinkdb-extraction virtualenv . . ./bin/activate pip install -r requirements.txt python rethinkgdb_extraction/crawl.py
That will crawl a few pages, and load them into a local RethinkDB instance.