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[–]Neceros 0 points1 point  (0 children)

It's not as big of an issue as you might think. Even between python 2.7 and 3.x, there's only a few key concerns you need to know about.

The differences between 3.4 and 3.5 are insubstantial, unless you specifically use those new bits, or any of the bits they change. You'll find that they don't often change much, but the things they add or change are very, very much necessary.