I've played a bit with Project Euler but all of their problems are math-centric, which is nice but not exactly what I'm looking for: some real-world programming problems to get back into the coding field.
So asking my friend Google, I found CodingBat: it has a Python section with several tasks to complete. I must say they are some kinda trivial to solve, once you know some idiomatic Python code, but some are a bit more interesting. If you're a junior Python coder, or want to get a grip on the language, give it a look.
Oh, and if you know some website that would give me some real-world programming coding problems (something that would be useful on the job, not just coding for fun), I would love to hear you.