I had said awhile back that I would shoot for a Python version since the code tries to be as Ruby-idiom-free as possible...but I think I need to first focus on moving it to a more painless deploying process, such as github+jekyll...and hopefully make it easy for anyone to port over the lessons/examples in other (high-level) languages
I'd honestly want to help you enable this using http://ruhoh.com. it's jekyll inspired but made to be a lot more streamlined.
The stack is markdown and mustache. This would be a great way for me to see how I need to evolve the ruhoh platform.
Can't honestly say this is the best platform for your book but I am willing to dedicate time to your project to get this done for everyone's benefit. Please contact me and/or point me to the public repo if available. thanks!