Flask
http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world
RESTful API
http://blog.miguelgrinberg.com/post/designing-a-restful-api-with-python-and-flask
http://blog.miguelgrinberg.com/post/designing-a-restful-api-using-flask-restful
http://blog.miguelgrinberg.com/post/writing-a-javascript-rest-client