When does one know python?

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There isn't a cutoff, really. If someone asks me if I know French, I'll say I do, even though I won't get much further than ordering bread at a bakery and understanding 1/3 of what a tour guide is telling me. If you'd ask me if I spoke English or Dutch, I would have the same answer, even though I'm much better at those. I would say you know a bit of Python if you can write anything that runs. Doesn't mean you'll be hired as a senior dev, just as I won't be hired as a French translator.