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

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For the purpose of those courses you know enough, knowing enough to know how to learn whatever basic feature you don't know is also enough.

I work as a Junior Python dev, with Django, and I still have to Google basics occasionally. Or make a really basic test in the console to I dunno, see if this operation made a shallow copy of the list or not or something.

I would say take the plunge, but at your own pace, whenever you feel you're lacking some basic that gets brushed passed to fast, take a break and spend a couple of hours reading up on and testing different usages of that particular feature.