Take a look at CodeSignal to practice the basic data structures of python3. Arrays ("lists"), Hash tables ("dictionaries"), trees, heaps, stacks, queues!
Once you get a feel for the different data structures, try out the Python Arcade. It is a nice tour of the different modules of python's standard library. Some of the problems are a little weird, so just skip them. I recorded my solutions to many of these problems here.
Start with that and I'll do another pull request when you want to go further.