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Re: Beginner needs advice

References (4 earlier) <BANLkTi=JCsVG1K++rz=VAgh_NSVXLe4Edw@mail.gmail.com> <mailman.2070.1306328295.9059.python-list@python.org> <VJODp.4281$wM1.3392@newsfe05.iad> <4ddfc8ae$0$29996$c3e8da3$5496439d@news.astraweb.com> <p%TDp.5771$cs1.3817@newsfe15.iad>
Date 2011-05-28 09:09 +1000
Subject Re: Beginner needs advice
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.2180.1306537755.9059.python-list@python.org> (permalink)

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On Sat, May 28, 2011 at 6:40 AM, harrismh777 <harrismh777@charter.net> wrote:
> Most 2.x code *will not* run correctly in 3.x/  Most of the best
> improvements and enhancements of 3.x will not back-port to below 2.7, and
> almost none of them will back-port before 2.6 (class decorations, for
> instance).

What's with the "below 2.7"? If you're comparing 3.x and 2.x, wouldn't
it be most plausible to compare 3.2 and 2.7?

And, the biggest reason for 2.x code not running on 3.x is probably
the print function. (Guess made without any data beyond my own
personal corpus of Python 2 code.) That's something that can be
corrected by, oh, I dunno, the 2to3 translator maybe? And the
__future__ import makes 2.6+ work the same way as 3.x.

> All of these things are for the better, I must add.  But, the point is that
> 3.x is completely incompatible with 2.x in real ways.  Arguing that this is
> *not true* because you are able to create a code block that just happens 'to
> work' in all versions (and that hasn't been verified yet) does not in *any*
> way 'prove' that 3.x is a compatible dialect---  far from it... its a
> straw-man argument.

You're correct that one code block does not prove the point. But your
argument is just as flimsy. To say that "most" 2.x code is
incompatible with 3.x is to deny the 2to3 utility, and you're ignoring
the people who deliberately write code that can cross-execute on
either version - which is really not that difficult, if you take some
care and use __future__ directives.

Chris Angelico

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Re: Beginner needs advice "Colin J. Williams" <cjw@ncf.ca> - 2011-05-25 08:57 -0400
  Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-27 09:40 -0500
    Re: Beginner needs advice Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-27 15:52 +0000
      Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-27 15:40 -0500
        Re: Beginner needs advice Chris Angelico <rosuav@gmail.com> - 2011-05-28 09:09 +1000
          Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-27 20:02 -0500
            Re: Beginner needs advice Ethan Furman <ethan@stoneleaf.us> - 2011-05-27 18:30 -0700
              Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-28 14:21 -0500
                Re: Beginner needs advice Chris Angelico <rosuav@gmail.com> - 2011-05-29 05:47 +1000
                Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-28 21:02 -0500
                Re: Beginner needs advice Chris Angelico <rosuav@gmail.com> - 2011-05-29 12:26 +1000
                Re: Beginner needs advice Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-29 14:09 +0000
                Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-30 19:32 -0500
                Re: Beginner needs advice "Rhodri James" <rhodri@wildebst.demon.co.uk> - 2011-05-31 01:58 +0100
                Re: Beginner needs advice Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-05-30 22:20 -0700
                Re: Beginner needs advice Ben Finney <ben+python@benfinney.id.au> - 2011-05-31 15:48 +1000
                Re: Beginner needs advice MRAB <python@mrabarnett.plus.com> - 2011-05-31 17:59 +0100
                Re: Beginner needs advice Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-05-31 10:22 -0700
                Re: Beginner needs advice Terry Reedy <tjreedy@udel.edu> - 2011-05-30 21:34 -0400
                Re: Beginner needs advice Terry Reedy <tjreedy@udel.edu> - 2011-05-30 21:47 -0400
                Re: Beginner needs advice Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-05-30 22:20 -0700
                Re: Beginner needs advice Benjamin Kaplan <benjamin.kaplan@case.edu> - 2011-05-30 22:35 -0700
            Re: Beginner needs advice Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-28 05:40 +0000
        Re: Beginner needs advice Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-28 06:15 +0000
          Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-28 21:33 -0500
            Re: Beginner needs advice Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-29 02:06 -0600
              Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-30 19:43 -0500
                Re: Beginner needs advice Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-30 19:16 -0600
                Re: Beginner needs advice Chris Angelico <rosuav@gmail.com> - 2011-05-31 12:27 +1000
                Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-30 22:02 -0500
            Re: Beginner needs advice Jason Tackaberry <tack@urandom.ca> - 2011-05-29 15:28 -0400
              Re: Beginner needs advice rantingrick <rantingrick@gmail.com> - 2011-05-29 16:00 -0700
                Re: Beginner needs advice Chris Angelico <rosuav@gmail.com> - 2011-05-30 09:31 +1000
              Re: Beginner needs advice harrismh777 <harrismh777@charter.net> - 2011-05-30 19:44 -0500
            Re: Beginner needs advice rantingrick <rantingrick@gmail.com> - 2011-05-29 15:15 -0700
            Re: Beginner needs advice Dotan Cohen <dotancohen@gmail.com> - 2011-05-31 20:56 +0300
            Re: Beginner needs advice Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-31 12:29 -0600
            Re: Beginner needs advice Dotan Cohen <dotancohen@gmail.com> - 2011-05-31 21:42 +0300
        Re: Beginner needs advice Dotan Cohen <dotancohen@gmail.com> - 2011-05-29 08:46 +0300
      Re: Beginner needs advice Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-05-28 07:06 +0200
        Re: Beginner needs advice Thorsten Kampe <thorsten@thorstenkampe.de> - 2011-05-28 08:38 +0200
          Re: Beginner needs advice Thorsten Kampe <thorsten@thorstenkampe.de> - 2011-05-28 08:42 +0200
          Re: Beginner needs advice Chris Angelico <rosuav@gmail.com> - 2011-05-28 16:44 +1000
          Re: Beginner needs advice Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-28 08:13 +0000
        Re: Beginner needs advice "D'Arcy J.M. Cain" <darcy@druid.net> - 2011-05-28 08:38 -0400

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