Re: Guido rethinking removal of cmp from sort method

From	Paul Rubin <no.email@nospam.invalid>
Newsgroups	comp.lang.python
Subject	Re: Guido rethinking removal of cmp from sort method
References	(1 earlier) <mailman.1175.1300888311.1189.python-list@python.org> <JfVkp.5068$sS4.4758@newsfe11.iad> <4d94326c$0$30003$c3e8da3$5496439d@news.astraweb.com> <R1elp.6224$sP1.5155@newsfe07.iad> <mailman.67.1301639410.2990.python-list@python.org>
Date	2011-04-01 00:45 -0700
Message-ID	<7x8vvue7or.fsf@ruckus.brouhaha.com> (permalink)
Organization	Nightsong/Fort GNOX

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Chris Angelico <rosuav@gmail.com> writes:
> Provably false. Even a well-designed interface, if it is asked to deal
> with a changing implementation and changing requirements, will
> eventually either acquire cruft, or be found too rigid to be of use.

What happens then is you define a new interface.  In Microsoft-speak if
the IWhatever interface needs an incompatible extension like new
parameters, they introduce IWhatever2 which supports the new parameters.
They change the implementation of IWhatever so it becomes a wrapper for
IWhatever2 setting the new parameters to default values, to keep
implementing the old behavior.

Removing cmp certainly isn't the most disruptive change of Python 3,
but it seems like the one with the least benefit.

Thread

Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-03-31 01:34 -0500
  Re: Guido rethinking removal of cmp from sort method Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-03-31 07:51 +0000
    Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-01 01:13 -0500
      Re: Guido rethinking removal of cmp from sort method Chris Angelico <rosuav@gmail.com> - 2011-04-01 17:30 +1100
        Re: Guido rethinking removal of cmp from sort method Paul Rubin <no.email@nospam.invalid> - 2011-04-01 00:45 -0700
          Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-01 12:59 -0400
          Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-01 14:57 -0400
            Re: Guido rethinking removal of cmp from sort method Paul Rubin <no.email@nospam.invalid> - 2011-04-01 12:22 -0700
              Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-01 22:21 -0400
              Re: Guido rethinking removal of cmp from sort method Antoon Pardon <Antoon.Pardon@rece.vub.ac.be> - 2011-04-04 11:34 +0200
                Re: Guido rethinking removal of cmp from sort method Lie Ryan <lie.1296@gmail.com> - 2011-04-04 23:35 +1000
                Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-04 13:26 -0400
                Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-04 15:05 -0400
              Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-04 13:22 -0400
          Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-01 15:37 -0400
            Re: Guido rethinking removal of cmp from sort method Paul Rubin <no.email@nospam.invalid> - 2011-04-01 14:37 -0700
              Re: Guido rethinking removal of cmp from sort method Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-02 00:42 +0000
                Re: Guido rethinking removal of cmp from sort method Paul Rubin <no.email@nospam.invalid> - 2011-04-01 19:31 -0700
              Re: Guido rethinking removal of cmp from sort method Benjamin Peterson <benjamin@python.org> - 2011-04-02 03:31 +0000
                Re: Guido rethinking removal of cmp from sort method Paul Rubin <no.email@nospam.invalid> - 2011-04-01 20:43 -0700
            Re: Guido rethinking removal of cmp from sort method Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-02 10:13 +0000
              Re: Guido rethinking removal of cmp from sort method rantingrick <rantingrick@gmail.com> - 2011-04-04 14:10 -0700
                Re: Guido rethinking removal of cmp from sort method Chris Angelico <rosuav@gmail.com> - 2011-04-05 07:41 +1000
                Re: Guido rethinking removal of cmp from sort method rantingrick <rantingrick@gmail.com> - 2011-04-04 15:16 -0700
                Re: Guido rethinking removal of cmp from sort method Chris Angelico <rosuav@gmail.com> - 2011-04-05 08:36 +1000
                Re: Guido rethinking removal of cmp from sort method Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-05 00:47 +0000
                Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-04 17:09 -0500
                Re: Guido rethinking removal of cmp from sort method Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-04 23:25 +0000
                Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-04 20:16 -0500
                Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-05 00:54 -0400
      Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-01 13:06 -0400
        Re: Guido rethinking removal of cmp from sort method Paul Rubin <no.email@nospam.invalid> - 2011-04-01 12:28 -0700
        Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-01 23:54 -0500
          Re: Guido rethinking removal of cmp from sort method Chris Angelico <rosuav@gmail.com> - 2011-04-02 16:06 +1100
            Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-02 00:17 -0500
              Re: Guido rethinking removal of cmp from sort method Chris Angelico <rosuav@gmail.com> - 2011-04-02 17:17 +1100
                Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-02 03:29 -0500
                Re: Guido rethinking removal of cmp from sort method Brian Quinlan <brian@sweetapp.com> - 2011-04-02 22:14 +1100
                Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-03 00:30 -0500
                Re: Guido rethinking removal of cmp from sort method geremy condra <debatem1@gmail.com> - 2011-04-02 22:46 -0700
                Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-03 02:17 -0500
                Re: Guido rethinking removal of cmp from sort method Brian Quinlan <brian@sweetapp.com> - 2011-04-03 16:36 +1000
                Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-02 22:14 -0400
                Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-03 00:26 -0500
                Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-04 01:38 -0400
          Re: Guido rethinking removal of cmp from sort method Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-02 09:39 +0000
            Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-03 00:09 -0500
  Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-03-31 11:26 -0400
    Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-01 01:44 -0500
      Re: Guido rethinking removal of cmp from sort method Terry Reedy <tjreedy@udel.edu> - 2011-04-01 15:13 -0400
        Re: Guido rethinking removal of cmp from sort method John Bokma <john@castleamber.com> - 2011-04-01 13:42 -0600
          Re: Guido rethinking removal of cmp from sort method Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-02 00:58 +0000
        Re: Guido rethinking removal of cmp from sort method harrismh777 <harrismh777@charter.net> - 2011-04-02 00:07 -0500

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