How do i upgrade Python on my RP3 with Hassbian?

[gpbenton (Graham)]

This was to v3.6, but the principal should be the same

Python 3.6 upgrade of a virtualenv

Everyone has been telling us the 3.6 upgrade for python is going to be required soon. I started running into some errors with some other things because I hadn’t upgraded, so I went ahead and figured I would spend the weekend making this work. Luckily so far, its been relatively painless. Basically there isn’t a good way to upgrade a python virtualenv. You really just have to blow the old one away and start over. But before you have a heart attack, that’s not to say you are blowing away your…