[scikit-learn] Python Version Support Policy

[Adrin]

I'd be in favor of whatever the conclusion of the same question on the
scipy-dev thread be (
https://mail.python.org/pipermail/scipy-dev/2020-August/024318.html)
which seems to be dropping 3.6 for the next release. But I don't think
we're going to be supporting only 3 latest releases
especially since Python has moved to the annual release cycle.

On Fri, Aug 21, 2020 at 4:23 PM Martin Thoma <info at martin-thoma.de> wrote:

> Hi :-)
>
> Did you discuss at some point a policy which Python versions you want to
> support? I see that scikit-learn supports at the moment 3.6, 3.7, and 3.8
> (badge in README). In a couple of weeks (October?) there will be 3.9, but I
> don't see any issue opened discussing 3.9
>
> A minor python increment (e.g. 3.8 -> 3.9) will now happen every year,
> IIRC. So maybe it would be nice to just say "we support the latest 3 Python
> versions". In the very least, this would mean that wheels are published and
> that the CI pipeline is run for the newer versions.
>
> I think it would also be nice to "deprecate" old features and drop support
> explicitly. For example, if scikit-learn dropped support for 3.6 we could
> use future annotations. The implication of such a drop of support would be
> a major version increase.
>
> Best regards,
> Martin
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