Google's Python Class - Assorted educational materials provided by Google.
Scott Murray Tutorials - Design, data, visualization, culture.
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
D3 Gallery - Mike Bostocks D3 examples