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Groups > comp.lang.python > #92463

Re: enhancement request: make py3 read/write py2 pickle format

From Serhiy Storchaka <storchaka@gmail.com>
Subject Re: enhancement request: make py3 read/write py2 pickle format
Date 2015-06-11 14:11 +0300
References (6 earlier) <5577b46d$0$12975$c3e8da3$5496439d@news.astraweb.com> <mailman.332.1433911768.13271.python-list@python.org> <5578053a$0$11102$c3e8da3@news.astraweb.com> <CABicbJJFURk+kwUO-wz8K5ZXY5TYUpqor1DLr0T30PaLkW5w4A@mail.gmail.com> <CAPTjJmrUWPv9sAO-UZc+xkSatS=LyLBdSJzpcNqFo1ByDKMUHg@mail.gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.389.1434021095.13271.python-list@python.org> (permalink)

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On 11.06.15 02:58, Chris Angelico wrote:
> On Thu, Jun 11, 2015 at 8:10 AM, Devin Jeanpierre
> <jeanpierreda@gmail.com> wrote:
>> The problem is that there are two different ways repr might write out
>> a dict equal to {'a': 1, 'b': 2}. This can make tests brittle -- e.g.
>> it's why doctest fails badly at examples involving dictionaries. Text
>> format protocol buffers output everything sorted, so that you can do
>> textual diffs for compatibility tests and such.
>
> With Python's JSON module [1], you can pass sort_keys=True to
> stipulate that the keys be lexically ordered, which should make the
> output "canonical". Pike's Standards.JSON.encode() [2] can take a flag
> value to canonicalize the output, which currently has the same effect
> (sort mappings by their indices). I did a quick check for Ruby and
> didn't find anything in its standard library JSON module, but knowing
> Ruby, it'll be available somewhere in a gem.

AFAIK Ruby's dicts are ordered. So the output is pretty stable.

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Re: enhancement request: make py3 read/write py2 pickle format Chris Angelico <rosuav@gmail.com> - 2015-06-10 09:06 +1000
  Re: enhancement request: make py3 read/write py2 pickle format Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2015-06-10 02:17 +0200
    Re: enhancement request: make py3 read/write py2 pickle format Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-06-09 17:47 -0700
      Re: enhancement request: make py3 read/write py2 pickle format Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-06-10 13:52 +1000
        Re: enhancement request: make py3 read/write py2 pickle format random832@fastmail.us - 2015-06-09 23:57 -0400
          Re: enhancement request: make py3 read/write py2 pickle format Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-06-10 15:43 +1000
        Re: enhancement request: make py3 read/write py2 pickle format Chris Angelico <rosuav@gmail.com> - 2015-06-10 14:00 +1000
        Re: enhancement request: make py3 read/write py2 pickle format Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-06-09 21:48 -0700
          Re: enhancement request: make py3 read/write py2 pickle format Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-06-10 19:36 +1000
            Re: enhancement request: make py3 read/write py2 pickle format Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2015-06-10 19:34 +0200
            Re: enhancement request: make py3 read/write py2 pickle format Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-06-10 15:10 -0700
              Re: enhancement request: make py3 read/write py2 pickle format Steven D'Aprano <steve@pearwood.info> - 2015-06-11 13:21 +1000
                Re: enhancement request: make py3 read/write py2 pickle format Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-06-10 22:39 -0700
                Re: enhancement request: make py3 read/write py2 pickle format Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-06-11 19:20 +1000
            Re: enhancement request: make py3 read/write py2 pickle format Terry Reedy <tjreedy@udel.edu> - 2015-06-10 19:25 -0400
            Re: enhancement request: make py3 read/write py2 pickle format Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-06-10 16:39 -0700
            Re: enhancement request: make py3 read/write py2 pickle format Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-06-10 16:48 -0700
            Re: enhancement request: make py3 read/write py2 pickle format Terry Reedy <tjreedy@udel.edu> - 2015-06-10 19:46 -0400
            Re: enhancement request: make py3 read/write py2 pickle format Chris Angelico <rosuav@gmail.com> - 2015-06-11 09:58 +1000
            Re: enhancement request: make py3 read/write py2 pickle format Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-06-10 17:02 -0700
              Re: enhancement request: make py3 read/write py2 pickle format Marko Rauhamaa <marko@pacujo.net> - 2015-06-11 07:08 +0300
            Re: enhancement request: make py3 read/write py2 pickle format Serhiy Storchaka <storchaka@gmail.com> - 2015-06-11 14:11 +0300
    Re: enhancement request: make py3 read/write py2 pickle format Chris Angelico <rosuav@gmail.com> - 2015-06-10 11:03 +1000

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