D3 Gallery - Mike Bostocks D3 examples
Google's Python Class - Assorted educational materials provided by Google.
D3 Tips and Tricks - Interactive Data Visualization in a Web Browser
Learn Python The Hard Way - One of the best guides to learn Python & coding in general
Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.
Think Python - Learning Resources