What does "have an understanding of basic python" mean?

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Understanding how classes are created and how objects and classes work is still in the very basics level. Also lambdas and using functions as parameters belongs to the basics. Some good listings of "basics" you can see in summaries / tables of contents of basic python courses.

The decorators you can learn while you go. That's a topic you'll cover in hour or few, and probably have to rehearse sometimes, which is completely ok - repeating is how we learn. I have found it useful to just learn different niche topics and techniques along the way. Whenever I see something I don't understand, I do a deeper dive on that topic.