The subreddit r/dailyprogrammer is a bit of a misnomer as there are only three posts a week. However, the posts are coding challenges. There's an easy one around Monday, an intermediate one around Wednesday, and a hard one around Friday. Along with the challenge they generally give a few test outputs and some bonus features you can try to implement. Sometimes all three challenges follow a similar theme (recently they had a week on magic squares). Sometimes the challenges are poorly written, but they are generally pretty good.
It's not Python specific, it's open to all languages. The last intermediate challenge had solutions posted in C, J, Nim, Ruby, and Scala so far. You often see Haskell, Java, Lisp, Python, and other odds and ends as well. If you're a beginner (or an expert) you can get feedback on your solution by asking for it.