[Bug 233770] [exp-run] make lang/python37 default python3

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233770

--- Comment #2 from Ruslan Makhmatkhanov <rm at FreeBSD.org> ---
Hi Kubilay!

Yes, you are right, this is just the first step in a plan of moving to python3
as default and we already did that in past without much problem - for example
switching from 3.5 to 3.6 was quite smooth AFAIR. 

Then we can do more broad exp-run with python 3.7 as default to identify ports
that are tied to python 2.x and mark them as such explicitly. This will allow
them to work after switching the tree to 3.7 as default.

I can't say how slowly the transition to 3.x is going, but ~1100 ports
installed in my system are python3 capable, except the exaile and deluge. And
moreover, the current trend for upstream is to drop python 2.x support
altogether like we saw it with gnome3, gajim, jupyter-notebook and scikit-learn
to name of few. 

While this should work, I'm all for discussing how to simplify the future
upgrades. We may chat at weekend if there are no objections.

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