setup: tweak error message for Python 3

Authored by indygreg.

Description

setup: tweak error message for Python 3

We now have beta support for Python 3. In my opinion, it isn't
yet stable enough to allow pip install Mercurial to work with
Python 3 out of the box: we don't want people accidentally using
Mercurial with Python 3 just yet.

But I do think we should be more friendly about informing people
of their options.

This commit tweaks the error message that users see when running
setup.py with Python 3. We instruct them about the current level
of Python 3 support, point them at the wiki for more info, and
give them instructions on how to bypass the check.

As part of this, I also changed which version value is printed,
as we were printing a named tuple before.

Details

Committed
indygregApr 21 2019, 11:57 AM
Parents
rHGbd92dd3eff42: setup: remove set and dict comprehensions
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