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From: "Ludovic Courtès" <ludo@gnu.org>
To: Konrad Hinsen <konrad.hinsen@fastmail.net>
Cc: guix-devel@gnu.org
Subject: Re: Removal of Python 2?
Date: Wed, 23 Jun 2021 17:26:45 +0200	[thread overview]
Message-ID: <87k0mkwqiy.fsf@gnu.org> (raw)
In-Reply-To: <m18s32ul5c.fsf@fastmail.net> (Konrad Hinsen's message of "Tue, 22 Jun 2021 14:41:19 +0200")

[-- Attachment #1: Type: text/plain, Size: 1378 bytes --]

Hi,

Konrad Hinsen <konrad.hinsen@fastmail.net> skribis:

>> Python 2 is dead, dead, dead like the parrot and end-of-prolonged life 
>> as of more than 1 1/2 years. Anyhow, there might still be quite some 
>> software not ported to Python 3 after 10 years. So I'm afraid we need to 
>> keep Python 2.
>
> At this time, more than 2500 packages still depend on Python 2, and
> that's not just Python libraries. The list includes packages such as
> TeXlive, LLVM, Rust, OpenJDK, Calibre, OCaml, qemu, etc.
>
> For many of these packages, Python 2 is used only as part of the build
> procedure. Which is run in a highly protective sandbox. So I don't think
> we need to worry much about having Python 2 in Guix. To discourage
> people from installing it by accident, we could make it a hidden
> package.

I agree.

What we could do is start removing ‘python2-’ packages, especially those
with a non-negligible maintenance cost (numpy, scipy, matplotlib, etc.).
We can move them to the Guix-Past channel if there’s interest.

The attached script lists unused ‘python2-’ leaf packages:

--8<---------------cut here---------------start------------->8---
$ guix repl -- unused-python2-packages.scm | wc -l
288
--8<---------------cut here---------------end--------------->8---

Are these good candidates for removal?

Thoughts?

Ludo’.


[-- Attachment #2: the script --]
[-- Type: text/plain, Size: 667 bytes --]

(use-modules (gnu packages)
             (guix)
             (guix graph)
             (guix scripts graph))

(define all
  (fold-packages cons '() #:select? (const #t)))

(with-store store
  (let ((back-edges (run-with-store store
                      (node-back-edges %bag-node-type all))))
    (define (unused-python2? package)
      (and (string-prefix? "python2-" (package-name package))
           (zero? (node-reachable-count (list package)
                                        back-edges))))
    (for-each (lambda (package)
                (when (unused-python2? package)
                  (format #t "~a~%" (package-name package))))
              all)))

  reply	other threads:[~2021-06-23 15:27 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-08 14:27 Questions regarding Python packaging Tanguy Le Carrour
2020-11-08 17:05 ` Leo Famulari
2020-11-10  8:35   ` Tanguy Le Carrour
2020-11-08 20:43 ` Michael Rohleder
2020-11-10  8:30   ` Tanguy Le Carrour
2020-11-09 16:54 ` Hartmut Goebel
2020-11-10  8:47   ` Tanguy Le Carrour
2020-11-10  8:53     ` Hartmut Goebel
2021-01-05 10:25 ` Lars-Dominik Braun
2021-01-06 15:32   ` Tanguy LE CARROUR
2021-01-22  8:38     ` Tanguy LE CARROUR
2021-01-23 12:34       ` Lars-Dominik Braun
2021-01-24 13:30         ` Tanguy LE CARROUR
2021-01-24 20:54         ` Ryan Prior
2021-01-25 11:47           ` Lars-Dominik Braun
2021-01-25 16:57             ` Ryan Prior
2021-02-05 10:40         ` Hartmut Goebel
2021-05-17  6:24         ` Lars-Dominik Braun
2021-06-06 16:44           ` Tanguy LE CARROUR
2021-06-06 19:44             ` Lars-Dominik Braun
2021-06-22  6:53               ` Removal of Python 2? Hartmut Goebel
2021-06-22 12:41                 ` Konrad Hinsen
2021-06-23 15:26                   ` Ludovic Courtès [this message]
2021-06-23 15:34                     ` zimoun
2021-06-23 18:32                     ` Konrad Hinsen
2021-06-22 18:02                 ` Ryan Prior
2021-06-25  6:37                   ` Konrad Hinsen
2021-06-22  7:00               ` Questions regarding Python packaging Hartmut Goebel
2021-06-28 11:59                 ` Lars-Dominik Braun
2021-06-28 20:37                   ` Hartmut Goebel
2021-06-29  7:20                     ` Lars-Dominik Braun
2021-07-06 12:16                       ` [bug#46848] " Lars-Dominik Braun
2021-07-07 15:01                       ` Hartmut Goebel
2021-01-26  7:21       ` Tanguy LE CARROUR
2021-01-27  3:43         ` Maxim Cournoyer
2021-01-06 15:37   ` Tanguy LE CARROUR

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