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I'm a big fan of Execute Program from Gary Bernhardt:

https://www.executeprogram.com/

It uses interactive exercises + spaced repetition. It's really the only way I've managed to learn Regular Expressions.

I would second this. I have pretty extensive experience in a few python-like languages, and had written a few hundred lines of python over the years, but had never had a full-time job writing it. I had an upcoming job working on a python codebase. I found ExecuteProgram to be a pretty great as a way to bone up on intermediate python syntax, idioms, and standard library so I could minimize the first few weeks of "How do I do [common thing I know in 5 other languages] in python?"

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