Drop Python 3.7 support in Sage 9.7

[slel]

This ticket is for everything concerning
dropping support for Python 3.7.

It can be set as a dependency for other tickets.

For instance tickets upgrading packages to
versions that no longer support Python 3.7.

Timeframe:

• Python 3.7 EOL is 2023-06. (https://endoflife.date/python)
• On debian-buster (EOL 2022-08, https://wiki.debian.org/DebianReleases), Python 3.7 is the default and newest available Python version.
• Some projects follow NEP 29 (see Adopt the “time window-based” policy for support of Python versions from NEP 29 #30384), which recommends to drop Python 3.7 already in 2021-12.
  • Update numpy to 1.22.x, scipy 1.8.x, networkx 2.8.x #32423 Update of numpy to 1.22.x, scipy 1.8

Related:

• Drop Python 3.6 support #30551: Drop Python 3.6 support (merged in Sage 9.4.beta0)
• Adopt the “time window-based” policy for support of Python versions from NEP 29 #30384: Adopt "time window-based" Python versions support policy
• Meta-ticket: Review of Python 3 features that sagelib should use systematically #29756: Meta-ticket: Review of Python 3 features that sagelib should use systematically

CC: @mkoeppe @slel @tobiasdiez @dimpase

Component: python3

Author: Matthias Koeppe

Branch/Commit: 4b121f7

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/32937

[mkoeppe]

Dependencies: #30766

[mkoeppe]

Changed dependencies from #30766 to none

[mkoeppe]

Dependencies: #33088

[mkoeppe]

Branch: u/mkoeppe/drop_python_3_7_support

[mkoeppe]

Last 10 new commits:

b46c953	README: Document --enable-editable and --enable-download-from-upstream-url
a3ffe84	README.md: Instructions for Apple Silicon
d7708df	README.md: Restructure macOS prep instructions
2e1d22d	src/doc/en/installation/source.rst: Remove instructions for Solaris, AIX, HP-UX
9ca39a2	README.md: Point to developer guide for git details
f1e1166	src/doc/en/installation/source.rst: Point to README.md for step-by-step instructions
3f6c6e0	src/doc/en/developer/workspace.rst: Link to Trac #30500
8716d80	src/doc/en/installation/source.rst: Update required venv Python extension modules from build/pkgs/python3/spkg-configure.m4
9419f7b	Merge #33088
b21789b	Drop Python 3.7 support

[mkoeppe]

Commit: b21789b

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

comment:8

Adding #33316 so that testing is done with the updated platforms for Sage 9.7

[mkoeppe]

Changed dependencies from #33088 to #33088, #33316

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. Last 10 new commits:

1124ded	build/pkgs/gcc/spkg-configure.m4: Bump minimum version to 6.3
4e8b2c2	README.md, src/doc/en/installation/source.rst: Update info on GCC versions
9b388ea	.github/workflows/tox*.yml: Update platforms for drop of GCC < 6.3
e7ff2a8	build/pkgs/gcc/spkg-configure.m4: Fixup
0713f53	.github/workflows/tox*.yml: Replace ubuntu-xenial by ubuntu-xenial-toolchain-gcc_9
d650177	Merge tag '9.6.rc2' into t/33316/drop_support_for_gcc___6_3_in_sage_9_7
a0e037f	build/bin/write-dockerfile.sh [debian]: Handle EXTRA_PATH, EXTRA_SYSTEM_PACKAGES
dae2d08	tox.ini (ubuntu-trusty-toolchain): Use binutils-2.26
33ca131	tox.ini, .github/workflows/tox*.yml: Add ubuntu-kinetic, linuxmint-21, fedora-37
ec32489	Merge #33316

[sagetrac-git]

Changed commit from b21789b to ec32489

[mkoeppe]

Reviewer: https://github.com/mkoeppe/sage/actions/runs/2295983166

[mkoeppe]

comment:11

Tests look fine. In particular on debian-buster-standard (https://github.com/mkoeppe/sage/runs/6357272222?check_suite_focus=true) Python 3.7.3 is now rejected and all tests pass.

Needs review

[dimpase]

Changed commit from ec32489 to 65cfa33

[dimpase]

Changed reviewer from https://github.com/mkoeppe/sage/actions/runs/2295983166 to Dima Pasechnik

[dimpase]

Changed branch from u/mkoeppe/drop_python_3_7_support to u/dimpase/drop_python_3_7_support

[dimpase]

comment:12

added a trivial reviewer patch, lgtm

---

New commits:

65cfa33

Python 3.7->3.8. in few places; bump Sage version to 9.7 in tutorial

[mkoeppe]

comment:13

Thank you!

[mkoeppe]

Changed branch from u/dimpase/drop_python_3_7_support to u/mkoeppe/drop_python_3_7_support

[mkoeppe]

Changed dependencies from #33088, #33316 to #33088

[mkoeppe]

comment:15

Rebased away from #33316.

---

New commits:

790dde8	Drop Python 3.7 support
4b121f7	Python 3.7->3.8. in few places; bump Sage version to 9.7 in tutorial

[mkoeppe]

Changed commit from 65cfa33 to 4b121f7

[mkoeppe]

Changed dependencies from #33088 to none

[vbraun]

Changed branch from u/mkoeppe/drop_python_3_7_support to 4b121f7