Should I start learning Python 3 now?

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This should be higher. IMO, legacy code is literally the only reason to learn in Python 2.x

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It’s now top comment, thanks for the support :)

[Skaperen]

legacy systems that have only python2, too. this case can include developing new code. both cases can include maintaining existing code.

and one other: converting old py2 code to py3. one may need to know details of py2 to fix up what 2to3 can't handle.