Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.maint.python > #9730

Re: MBF for deprecating Python2 usage

Path csiph.com!feeder.erje.net!2.eu.feeder.erje.net!news.roellig-ltd.de!open-news-network.org!weretis.net!feeder4.news.weretis.net!news.mixmin.net!aioe.org!news.servidellagleba.it!bofh.it!news.nic.it!robomod
From Ben Finney <bignose@debian.org>
Newsgroups linux.debian.maint.python
Subject Re: MBF for deprecating Python2 usage
Date Tue, 08 Aug 2017 03:40:02 +0200
Message-ID <uc1F0-zY-7@gated-at.bofh.it> (permalink)
References <uawjU-5YP-3@gated-at.bofh.it> <uazhM-8iN-19@gated-at.bofh.it> <uaBtf-1rM-9@gated-at.bofh.it> <uaLCi-867-15@gated-at.bofh.it> <ubYe6-6ih-19@gated-at.bofh.it> <ubZ0u-6St-15@gated-at.bofh.it> <ubZMR-7qT-11@gated-at.bofh.it> <ubZWy-7wz-3@gated-at.bofh.it>
X-Mailbox-Line From debian-python-request@lists.debian.org Tue Aug 8 01:30:32 2017
Old-Return-Path <debian-python@m.gmane.org>
X-Amavis-Spam-Status No, score=-6.206 tagged_above=-10000 required=5.3 tests=[BAYES_00=-2, HEADER_FROM_DIFFERENT_DOMAINS=0.001, LDO_WHITELIST=-5, RDNS_NONE=0.793] autolearn=no autolearn_force=no
X-Policyd-Weight using cached result; rate:hard: -6.1
X-Injected-Via-Gmane http://gmane.org/
Lines 33
MIME-Version 1.0
Content-Type text/plain; charset=utf-8
Content-Transfer-Encoding 8bit
User-Agent Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
X-Public-Key-ID 0xAC128405
X-Public-Key-Fingerprint 517C F14B B2F3 98B0 CB35 4855 B8B2 4C06 AC12 8405
X-Public-Key-URL http://www.benfinney.id.au/contact/bfinney-pubkey.asc
X-Post-From Ben Finney <bignose+hates-spam@benfinney.id.au>
Cancel-Lock sha1:Eg1gTgdBoicgVSXx4+SiCL2+2/8=
X-Mailing-List <debian-python@lists.debian.org> archive/latest/15111
List-ID <debian-python.lists.debian.org>
List-URL <https://lists.debian.org/debian-python/>
List-Archive https://lists.debian.org/msgid-search/85inhyn8zk.fsf@benfinney.id.au
Approved robomod@news.nic.it
Organization linux.* mail to news gateway
Sender robomod@news.nic.it
X-Original-Date Tue, 08 Aug 2017 11:28:31 +1000
X-Original-Message-ID <85inhyn8zk.fsf@benfinney.id.au>
X-Original-References <f8492955-8f73-8a18-456d-5bb400b5aff7@debian.org> <3109A909-3338-4717-BFD2-D65E9206FD7F@debian.org> <9614BFBC-E260-48A6-B722-DDD41E715A20@kitterman.com> <92E6FF73-391C-45FE-A213-6AAED284629D@debian.org> <1502142757.2351.35.camel@ghic.org> <690EAE7E-8005-4723-891E-C2E30C3B35AD@debian.org> <85shh3lzp1.fsf@benfinney.id.au> <1502149701.2351.60.camel@ghic.org>
X-Original-X-Complaints-To usenet@blaine.gmane.org
Xref csiph.com linux.debian.maint.python:9730

Show key headers only | View raw

Diane Trout <diane@ghic.org> writes:

> My suggestion was "the startup banner should print what command to run
> to get Python 2."

Thanks for the suggestion. I think it's a bad idea.

> I was thinking of the case of the end-user trying to follow a Python
> tutorial. They'd still need to exit and run the python2 command if they
> wanted 2.

That's not the issue.

The issue is: Invoking ‘python’ today gets an interpereter, Python 2,
that will work with some code and not others. It should not tomorrow
invoke an incompatible interpreter without *knowing* that the vast
majority of scripts in the wild no longer expect Python 2 to come from
that command.

That day might never come, in which case the ‘python’ command will
forever mean Python 2. That is, I'm saying, better than breaking that
command in the near or medium future.

I'm saying it's a bad idea for ‘python’ tomorrow to get an incompatible
intepreter that won't run the same Python code. That interpreter is
named ‘python3’ and should never be installed as ‘python’, because
‘python’ is a command that many scripts expect to invoke Python 2.

-- 
 \     “Reality must take precedence over public relations, for nature |
  `\       cannot be fooled.” —Richard P. Feynman, _Rogers' Commission |
_o__)                       Report into the Challenger Crash_, 1986-06 |
Ben Finney

Back to linux.debian.maint.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

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

csiph-web