I've noticed that the layout of the site is uncannily similar to flask's documentation (http://flask.pocoo.org/docs/), down to the "Fork me on Github" in the top right corner. Is there some sort of software producing this kind of documentation?
Requests is hosted on a site called Read the Docs, which does documentation hosting for Sphinx projects: http://readthedocs.org/
Sphinx has become the defacto documentation tool for Python projects, and a lot of other projets as well. Notably a number of PHP projects, and Varnish the web cache use it also.
http://www.pocoo.org/projects/#project-hub shows all of their projects. Pocoo significantly improves the lives of all Python developers. Thanks pocoo team!
Looks like he just co-opted the theme (Pocoo might have it available somewhere, but I couldn't find it). Nothing wrong with that, it's a great theme.
https://github.com/kennethreitz/kr-sphinx-themes
The original is here: https://github.com/mitsuhiko/flask-sphinx-themes