What is involved in switching from python 27 to python 36?

I've been using python 27 for a while. I've run into a problem with youtube-dl 
needing a newer python.

But I don't know what I need to do to safely update. It's not like python2 is a 
different program than python3 (same "python" in both cases), and as I 
understand it, not everything written for P2 is compatible with P3.

So what's the proper way to upgrade?
Or is there a way to have both installed at the same time? (but then ... 
!#/usr/bin/env python ...)

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Entertaining minecraft videos
http://YouTube.com/keybounce

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