I think it is a great idea. Even if the system python is older than one needed, one can still use e.g. pyenv to get an up to date python, without the need to build your own.
And pyenv does allow us to drop python3 spkg, something we should do, too. Dima On Sat, 25 Feb 2023, 07:16 Matthias Koeppe, <matthiaskoe...@gmail.com> wrote: > For a bit of necessary context: The NEP 29 drop schedule is much faster > than the EOL schedule of Python itself. Python 3.8 is supported until > 2024-10, but NEP 29 already drops it 2023-04. > > NEP 29 is intended to improve interoperability of fast-moving scientific > software. It is quite relevant where in the dependency streams a project > is. NumPy, SciPy are *upstream* of many projects and *downstream* of > nothing. In contrast, Sage is *downstream* of lots and lots of projects, > and currently *upstream* of nothing except for some user packages. > > Effectively I don't think we need to make any commitment to a particular > schedule at a time, as the upgrades of major dependencies (mostly NumPy, > SciPy, NetworkX, SymPy) just force us to drop support for a particular > Python version. > For example, a SciPy upgrade to the 1.10 series is due for 10.0 (and > already positively reviewed in https://github.com/sagemath/sage/pull/35082); > it still supports Python 3.8. The following SciPy release 1.11 (which will > drop Python 3.8) is not coming out before 2023-07. So we would gain nothing > by dropping Python 3.8 already in a Sage 10.0 release some this spring. > > Of course, another argument for dropping support for a Python version > (such as Python 3.8) would be that it is missing critical features that > hold us back in the development of the Sage library. Issue > https://github.com/sagemath/sage/issues/29756 has a bit of this > discussion. > > > On Friday, February 24, 2023 at 7:10:07 PM UTC-8 Tobias Diez wrote: > >> Hi all, >> >> I propose to follow the NumPy enhancement proposal 29: "Recommend Python >> and Numpy version support as a community policy standard" available at: >> https://numpy.org/neps/nep-0029-deprecation_policy.html >> >> In essence it specifies when it's okay to drop support for old Python >> version. Namely, a release should support "all minor versions of Python >> released 42 months prior to the project, and at minimum the two latest >> minor versions. ". In particular, this means: >> - On Apr 14, 2023 drop support for Python 3.8 (initially released on Oct >> 14, 2019) >> - On Apr 05, 2024 drop support for Python 3.9 (initially released on Oct >> 05, 2020) >> >> The main idea of NEP 29 is to have a community-wide standard to prevent >> issues with e.g. dependencies dropping support for older Python versions to >> early. It is followed by many scientific packages such as Scipy, >> Matplotlib, and IPython, among others. Sage itself is also roughly >> following it (based on the past drops, e.g. Python 3.7 support was dropped >> 9 months ago and NEP recommends Dec 26, 2021). But as far as I'm aware >> there is not yet a clear policy for when to drop support for older versions. >> >> Of course, the dates in the NEP 29 are only a guideline and not set in >> stone, e.g. you don't want to drop support at the end of the release cycle >> just because the NEP says so. But for example, Sage 10 will be most likely >> released after Apr 14 2023, so we can now already drop support for Python >> 3.8. >> >> Relevant issue: https://github.com/sagemath/sage/issues/30384 >> >> -- > You received this message because you are subscribed to the Google Groups > "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-devel+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sage-devel/a232c964-b216-4e4f-86f0-b987c1455fc6n%40googlegroups.com > <https://groups.google.com/d/msgid/sage-devel/a232c964-b216-4e4f-86f0-b987c1455fc6n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/CAAWYfq15pV1hYFkP3cH9309bzHHgJT4Be%3DTYZSqo3q4C7bvAvg%40mail.gmail.com.
