Hi,
On 2018-11-27 14:14:24 +0100, Peter Eisentraut wrote:
> On 25/11/2018 23:14, Tom Lane wrote:
> > Andres Freund <andres@anarazel.de> writes:
> >> On 2018-11-24 15:49:25 -0500, Tom Lane wrote:
> >>> There's been some preliminary discussion about starting to default to
> >>> python3, but given this project's inherent conservatism, I don't expect
> >>> that to happen for some years yet. In any case, whenever we do pull
> >>> that trigger we'd surely do so only in HEAD not released branches, so
> >>> buildfarm owners will need to deal with the case for years more.
> >
> >> Why don't we probe for python2 in addition to python by default? That
> >> ought to make RHEL 8 work, without making the switch just yet.
> >
> > I'm unexcited about that because that *would* be expressing a version
> > preference --- and one that's on the wrong side of history.
>
> I think it would be appropriate to probe in the order
>
> python python3 python2
>
> This would satisfy most scenarios that are valid under PEP 394.
ISTM we should first go for python, python2, python3 in all branches,
and then have a separate master only commit that changes over the order
to prefer python3 over 2. I don't think preferring 3 over 2 would be
appropriate for past branches, but it'll surely become more common to
run into distros without "python" installed.
Greetings,
Andres Freund