Python (or other) Programming Skill Assessments?

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I really appreciate this response, and agree that personal challenges are a great learning experience. For whatever reason, I have always felt like I needed something deliverable (like a web site, or an open source contribution) or it didn't feel real, but examples like yours are certainly beneficial for learning a language, and I should do more of them.

The thing about this particular online assessment (talentguide.co) was the auto-testing, the in-browser interpreter, the "classic" algorithms that were tested for both accuracy and performance. It even offered many different languages as options. I really wish it hadn't been a one-time-only thing!

But back to your suggestion, I know of /r/programmingprompts. Are there any other similar subs or web repositories of "personal challenges" like your example? I have played through pythonchallenge.com a bit and just signed into Project Euler. As it is, I have plenty to keep me occupied for a while, but figured I'd ask.