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Groups > linux.debian.maint.python > #9742

Re: MBF for deprecating Python2 usage

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On Mon, Aug 07, 2017 at 08:11:40PM -0700, Diane Trout wrote:

> > What I am opposing is the suggestion to install, in the near to
> > medium
> > term, a command of exactly the same name that has subtly similar but
> > incompatible behaviour, when that behaviour *already* has a command –
> > ‘python3’ – that is widely used by those who need it.

> my problem with that plan is all of the printed documentation saying to
> learn python, type "python".

> At the very least there needs to a usr/bin/python that prints
> instructions about what you should run.

FWIW I don't share Ben's concern about this being a "backwards incompatible"
change (who is relying on the precise contents of the banner when running
'python' interactively?!).

But I am concerned about possible implementation strategies here.  exec() is
a very expensive syscall, and python is a frequently used interpreter.  If
this were implemented as a wrapper that checked isatty(), printed a banner,
and then re-execed the real python, that could have a measurable performance
impact on some applications.  There is a reason /usr/bin/python,
/usr/bin/gcc, etc. are always symlinks to the real interpreter on Debian,
not wrapper scripts - other distributions have tried to do this as a wrapper
script and the result wasn't pretty.

Avoiding the performance hit would require that any changes to the banner
be made in the python source itself.

-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek@ubuntu.com                                     vorlon@debian.org

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Thread

MBF for deprecating Python2 usage Matthias Klose <doko@debian.org> - 2017-08-04 00:00 +0200
  Re: MBF for deprecating Python2 usage barry@debian.org - 2017-08-04 03:10 +0200
    Re: MBF for deprecating Python2 usage Scott Kitterman <debian@kitterman.com> - 2017-08-04 05:30 +0200
      Re: MBF for deprecating Python2 usage Piotr Ożarowski <piotr@debian.org> - 2017-08-04 08:10 +0200
      Re: MBF for deprecating Python2 usage barry@debian.org - 2017-08-04 16:20 +0200
        Re: MBF for deprecating Python2 usage Ole Streicher <olebole@debian.org> - 2017-08-04 17:10 +0200
          Re: MBF for deprecating Python2 usage Barry Warsaw <barry@debian.org> - 2017-08-04 17:50 +0200
        Re: MBF for deprecating Python2 usage Scott Kitterman <debian@kitterman.com> - 2017-08-04 23:10 +0200
          Re: MBF for deprecating Python2 usage Barry Warsaw <barry@debian.org> - 2017-08-05 03:40 +0200
            Re: MBF for deprecating Python2 usage Scott Kitterman <debian@kitterman.com> - 2017-08-05 04:10 +0200
          Re: MBF for deprecating Python2 usage Geoffrey Thomas <geofft@ldpreload.com> - 2017-08-08 00:50 +0200
        Re: MBF for deprecating Python2 usage Diane Trout <diane@ghic.org> - 2017-08-08 00:00 +0200
          Re: MBF for deprecating Python2 usage Barry Warsaw <barry@debian.org> - 2017-08-08 00:50 +0200
            Re: MBF for deprecating Python2 usage Ben Finney <bignose@debian.org> - 2017-08-08 01:40 +0200
              Re: MBF for deprecating Python2 usage Diane Trout <diane@ghic.org> - 2017-08-08 01:50 +0200
                Re: MBF for deprecating Python2 usage Ben Finney <bignose@debian.org> - 2017-08-08 03:40 +0200
                Re: MBF for deprecating Python2 usage Barry Warsaw <barry@debian.org> - 2017-08-08 04:00 +0200
                Re: MBF for deprecating Python2 usage Ben Finney <bignose@debian.org> - 2017-08-08 04:20 +0200
                Re: MBF for deprecating Python2 usage Diane Trout <diane@ghic.org> - 2017-08-08 05:10 +0200
                Re: MBF for deprecating Python2 usage Ben Finney <bignose@debian.org> - 2017-08-08 05:30 +0200
                Re: MBF for deprecating Python2 usage Diane Trout <diane@ghic.org> - 2017-08-08 05:40 +0200
                Re: MBF for deprecating Python2 usage Ben Finney <bignose@debian.org> - 2017-08-08 06:00 +0200
                Re: MBF for deprecating Python2 usage Barry Warsaw <barry@debian.org> - 2017-08-08 07:00 +0200
                Re: MBF for deprecating Python2 usage Geoffrey Thomas <geofft@ldpreload.com> - 2017-08-08 04:10 +0200
                Re: MBF for deprecating Python2 usage Ben Finney <bignose@debian.org> - 2017-08-08 04:30 +0200
                Re: MBF for deprecating Python2 usage Diane Trout <diane@ghic.org> - 2017-08-08 05:20 +0200
                Re: MBF for deprecating Python2 usage Ben Finney <bignose@debian.org> - 2017-08-08 05:40 +0200
                Re: MBF for deprecating Python2 usage Steve Langasek <vorlon@debian.org> - 2017-08-08 07:30 +0200
                Re: MBF for deprecating Python2 usage Ben Finney <bignose@debian.org> - 2017-08-08 08:20 +0200
                Re: MBF for deprecating Python2 usage Geoffrey Thomas <geofft@ldpreload.com> - 2017-08-10 17:40 +0200
                Re: MBF for deprecating Python2 usage Ole Streicher <olebole@debian.org> - 2017-08-08 21:20 +0200
                Re: MBF for deprecating Python2 usage Scott Kitterman <debian@kitterman.com> - 2017-08-08 21:30 +0200
    Re: MBF for deprecating Python2 usage Matthias Klose <doko@debian.org> - 2017-08-04 13:00 +0200
      Re: MBF for deprecating Python2 usage Scott Kitterman <debian@kitterman.com> - 2017-08-04 14:40 +0200
  Re: MBF for deprecating Python2 usage Adrian Bunk <bunk@debian.org> - 2017-08-07 00:00 +0200
  Re: MBF for deprecating Python2 usage Adrian Bunk <bunk@debian.org> - 2017-08-07 01:00 +0200
  Re: MBF for deprecating Python2 usage Christian Seiler <christian@iwakd.de> - 2017-08-07 01:10 +0200

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