The particular ticket in question deals with matplotlib, which has Python
as a dependency, so I think we can safely build with "Sage's Python 3",
which should be at least 3.6. If we can accommodate older version of Python
for the rest of the Sage build — and I think we can, given the current
state of affairs — then I don't see why we shouldn't. If it becomes a true
annoyance to deal with older Pythons, then we dump support for them, but I
don't think we need to hurry to do that.
On Wednesday, May 27, 2020 at 5:08:41 PM UTC-7, Michael Orlitzky wrote:
>
> On 5/27/20 4:08 PM, Volker Braun wrote:
> > Which python versions do we want to be compatible with now? Please
> separate
> >
> >
> > A)Supported Python versions for building Sage
> >
> > Note that I'm already seeing f-strings in #29547 so unless a policy is
> > formulated real soon the de-facto answer is going to be Python 3.6+
>
> This is OK, see below.
>
>
> > B) Supported Python versions for running Sage
> >
> > The default answer for B) is whatever is
> > in build/pkgs/python3/package-version.txt, of course
>
> I think we should make the two agree, to avoid pointless complexity. We
> should base this (ongoing) decision off of (a) what is supported by
> python upstream and (b) what is supported by the distributions that
> consistently package and contribute to sage.
>
> A rough list of the distributions that we should be nice to is,
>
> $ find ./build/pkgs/ -path '*/distros/*.txt' -exec basename '{}' \; \
> | sort -u
> alpine.txt
> arch.txt
> centos.txt
> conda.txt
> cpan.txt
> cygwin.txt
> debian.txt
> fedora.txt
> freebsd.txt
> gentoo.txt
> homebrew.txt
> nix.txt
> opensuse.txt
> slackware.txt
>
> And the upstream list is at,
>
> https://devguide.python.org/#branchstatus
>
> A policy like "we support the latest security release branch, and all
> bugfix release branches" looks like it will do the trick presently.
> (Ignoring the intermediate bugfix branches won't be much easier, since
> the newest security release lacks all of the same features.)
>
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