I came here to say exactly this ... you're better off upgrading your systems as you can. There's one point missing above - do you really want to use a version

I came here to say exactly this ... you're better off upgrading your systems as you can. There's one point missing above - do you really want to use a version of Python that's maintained by one person and of unknown quality? You're better off staying on 2.7 if you can't afford to upgrade.