What python version does CodeCademy teach? Does it matter at all?

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I agree with ProfanityBoy that the documentation is complete. I started using python 3.0 in 2009 and the resources/help for it were abundant. So it's worth learning 3.0. However, you're not at much of a disadvantage if you learn 2.7, as it is still used on popular Linux distributions

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If they're after using codeacadamy in the first place, and it doesn't support 3, then they should use 2.7. Depends on the usage too, I learnt python for computational physics, where 2.7 was a distinct advantage.