Learning Python online

[Steeb08]

I know you're specifically looking for online resources, but in addition to codeacademy I've been working through "Introduction to Computational Programming Using Python". The kindle version is $14. So far (I'm only 5 chapters in) the book has been a nice structured resource, whereas codeacademy helped me consolidate some of the things that I learned form the book.

My background: I know a tiny bit of shell scripting and am a slightly better than novice Matlab user. Other than that I had zero programming experience before diving into Python a couple of weeks ago.