Ariya Hidayat & co have put a monumental amount of effort into exposing the inner workings of webkit in phantomjs - I'm not sure I see the necessity for a python rewrite. Taking a quick look at the code, most everything I use phantomjs for outside of screenshotting is not available. A great start for sure, but unless there are some fundamental shortcomings with phantomjs that I'm unaware of, I agree with boothead that python bindings are probably the way to go.