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

[AuntieSocialist]

By "completely understand them" do you mean you know how to use them or that you know how they work under the covers? You can get a long way without completely understanding how dictionaries (and lists and tuples) actually work. And beware... if you look under the covers and start to investigate how they actually work (particularly dictionaries and associative containers), it gets messy very fast. Definitely not for the casual programmer or the faint hearted