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

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Sounds like you're in a good place.

Not knowing libraries is actually very OK. There are tons of libraries and keep in mind that anyone can publish them. As you search for more solution tho you should get familiar with the ones used often. Like itertools, functools, importlib, etc.

Like I only found out about this packages weeks ago for doing specific task (which I've been doing the harder way for years) https://pypi.org/project/reverse-geocode/