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