Drop Python 3.6 support #30551

slel · 2020-09-10T18:15:01Z

This can be a dependency for other tickets.

For instance tickets updating dependencies to
versions that dropped support for Python 3.6.

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
Python 3.7+: setlocale: LC_ALL: cannot change locale (C.UTF-8) from build/bin/sage-spkg and in doctests; disable use of system Python 3.6 #30053 - can be dropped if 3.6 is gone

Depends on #30913

CC: @fchapoton @mkoeppe @orlitzky @dimpase @vbraun

Component: python3

Author: Tobias Diez, Matthias Koeppe

Branch/Commit: b06731c

Reviewer: Matthias Koeppe, Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/30551

The text was updated successfully, but these errors were encountered:

mkoeppe · 2020-09-10T18:21:19Z

comment:1

I don't think there is anything that says that we "should" drop Python 3.6 support.

slel · 2020-09-10T19:02:11Z

comment:3

Replying to @mkoeppe:

I don't think there is anything that says
that we "should" drop Python 3.6 support.

Oh good, then let's support it as long as we can.

By the way #15530 and #15980 which started support
for Python 3.6 are almost ready to be closed.

dimpase · 2020-09-15T11:56:10Z

comment:4

#30053 says that we must drop Python 3.6 - unless you want to have a go at it.

it seems that some of our code related to docbuilding is too new for 3.6, and perhaps our Sphinx is too new too.

Besides, the EOL for 3.6 is late 2021, which is soon.

tobiasdiez · 2020-12-05T12:18:39Z

comment:6

What do you think about adopting the Python version strategy of numpy, according to which "a project with a major or minor version release in November 2020 should support Python 3.7 and newer"?

mkoeppe · 2020-12-05T17:33:53Z

comment:7

Replying to @tobiasdiez:

What do you think about adopting the Python version strategy of numpy, according to which "a project with a major or minor version release in November 2020 should support Python 3.7 and newer"?

That's #30384

tobiasdiez · 2020-12-07T22:04:16Z

comment:8

According to NEP 29, "a project with a major or minor version release in November 2020 should support Python 3.7 and newer." and thus this ticket can be closed in my opinion.

(Documentation for following NEP 29 is added in #30384.)

mkoeppe · 2020-12-07T22:14:49Z

comment:9

??!

This ticket is for dropping support for Python 3.6 -- this involves changing what system python versions we accept (build/pkgs/python3/spkg-configure.m4) and removing python3.6 workarounds from the code.

NEP 29 would already allow us to drop support now -- but I don't think we want to do it now (because of Sage's traditional role of providing a distribution that people can install onto ancient machines) -- hence the milestone is set to "pending".

tobiasdiez · 2020-12-07T23:15:57Z

Commit: c5436df

tobiasdiez · 2020-12-07T23:15:57Z

comment:11

Sorry, it wasn't clear to me from the ticket description that this is more than a placeholder to mark dependencies on Python 3.6.

NEP 29 is actually quite explicit about that one should drop support after the 42 months, e.g "On Jun 23, 2020 drop support for Python 3.6 (initially released on Dec 23, 2016)". Of course, it could be sage's policy to support also older python versions, but that's then no longer NEP 29 (in it's strict form). However, one should also keep in mind that supporting old Python versions results in technical debt that might be bigger than the gains from supporting old systems.

Also correct me if I'm wrong, but since sage is also installing its own python version, sage can still be used on older systems, right? It is just that the system python is not used.

Anyway, I've tried to locate all workarounds that are in place for Python 3.6 support, and removed them (I've probably missed a few, but maybe its good anyway to pay of the technical debt in follow up tickets). Moreover, I've upgraded the requirements to 3.7 (again, I might have missed something).

New commits:

`7d97a56`	`Partially revert "Allow Sage to work with a system Python 3.6."`
`2ed040b`	`Revert #30576`
`01000e8`	`Partially revert #30008`
`c5436df`	`Require at least Python 3.7`

tobiasdiez · 2020-12-07T23:15:57Z

Branch: public/python3/drop36

slel · 2020-12-17T20:29:30Z

comment:12

Other projects dropping support for Python 3.6:

Networkx,
see Networkx PR #4469 "Drop Py3.6 support per NEP 29"
merged 2020-12-17
NumPy 1.20, see NumPy 1.20.rc1 released 2020-12-03
SciPy 1.6.0, see SciPy 1.6.0rc1 released 2020-12-11

mkoeppe · 2020-12-19T00:31:21Z

comment:13

In this change:

 - **ar** and **ranlib**: can be obtained as part of GNU binutils.
 - **tar**: GNU tar version 1.17 or later, or BSD tar.
-- **python**: Python 3, 3.6 or later, or Python 2.7 (deprecated).
+- **python**: Python 3.7 or later (Python 2.7 or Python <= 3.6 support is deprecated).

Both the original text and the new one are not correct. This part refers to the sage-bootstrap-python which has much wider range of supported python versions, including Python >= 2.6 and Python >= 3.4 - according to build/tox.ini.

sagetrac-git · 2020-12-19T09:18:13Z

Changed commit from c5436df to 5c9983d

sagetrac-git · 2020-12-19T09:18:13Z

Branch pushed to git repo; I updated commit sha1. New commits:

`5c9983d`	`Correct versions for installation from source`

tobiasdiez · 2020-12-19T09:18:31Z

comment:15

Replying to @mkoeppe:

In this change:
 - **ar** and **ranlib**: can be obtained as part of GNU binutils.
 - **tar**: GNU tar version 1.17 or later, or BSD tar.
-- **python**: Python 3, 3.6 or later, or Python 2.7 (deprecated).
+- **python**: Python 3.7 or later (Python 2.7 or Python <= 3.6 support is deprecated).
Both the original text and the new one are not correct. This part refers to the sage-bootstrap-python which has much wider range of supported python versions, including Python >= 2.6 and Python >= 3.4 - according to build/tox.ini.

I've changed the versions now.

mkoeppe · 2021-05-19T15:13:52Z

comment:44

Replying to @dimpase:

what's the problem here?

It is a change to sage-bootstrap-python; but we are NOT changing support for bootstrapping with old Python versions.

sagetrac-git · 2021-05-19T15:15:07Z

Changed commit from b06731c to bc27c45

sagetrac-git · 2021-05-19T15:15:07Z

Branch pushed to git repo; I updated commit sha1. New commits:

`bc27c45`	`Revert "Partially revert #30008"`

mkoeppe · 2021-05-19T15:16:02Z

comment:47

@vbraun - if it's too late for this change, I can also put this reverting commit on a new ticket.

dimpase · 2021-05-19T15:19:06Z

comment:48

ok.

mkoeppe · 2021-05-26T01:25:59Z

comment:49

Looks like the earlier version, b06731c, was merged in 9.4.beta0.

New commits:

`bc27c45`	`Revert "Partially revert #30008"`

sagetrac-git · 2021-05-26T01:30:27Z

Changed commit from bc27c45 to b06731c

sagetrac-git · 2021-05-26T01:30:27Z

Branch pushed to git repo; I updated commit sha1 and set ticket back to needs_review. This was a forced push. New commits:

mkoeppe · 2021-05-26T01:35:30Z

comment:51

I've put the missing commit on #31860.

vbraun · 2021-05-27T20:30:10Z

Changed branch from public/python3/drop36 to b06731c

slel added this to the sage-9.3 milestone Sep 10, 2020

slel added c: python3 labels Sep 10, 2020

mkoeppe removed this from the sage-9.3 milestone Sep 10, 2020

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tobiasdiez added s: needs review and removed pending labels Dec 7, 2020

mkoeppe added pending s: needs work and removed s: needs review labels Dec 7, 2020

tobiasdiez added s: needs review and removed s: needs work labels Dec 7, 2020

mkoeppe added s: needs review and removed s: needs work labels May 19, 2021

dimpase added s: positive review and removed s: needs review labels May 19, 2021

sagetrac-git mannequin added s: needs review and removed s: positive review labels May 26, 2021

mkoeppe added s: positive review and removed s: needs review labels May 26, 2021

vbraun removed the s: positive review label May 27, 2021

vbraun closed this as completed in 3859440 May 27, 2021

This was referenced May 27, 2021

recognizable series (a base for k-regular sequences) #21295

Closed

Polyhedron.affine_hull: more output options #27366

Closed

slel mentioned this issue May 29, 2022

Drop Python 3.7 support in Sage 9.7 #32937

Closed

mkoeppe mentioned this issue May 25, 2023

Drop support for Python 3.8 #35404

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Drop Python 3.6 support #30551

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Drop Python 3.6 support #30551

Drop Python 3.6 support #30551

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