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Re: Flexible string representation, unicode, typography, ...

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From Terry Reedy <tjreedy@udel.edu>
Subject Re: Flexible string representation, unicode, typography, ...
Date Sun, 02 Sep 2012 22:33:55 -0400
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On 9/2/2012 9:54 PM, Steven D'Aprano wrote:
> On Sun, 02 Sep 2012 23:38:49 +0300, Serhiy Storchaka wrote:
>
>> On 30.08.12 09:55, Steven D'Aprano wrote:
>>> And Python's solution uses those: UCS-2, UCS-4, and UTF-8.
>>
>> I see that this misconception widely spread.
>
> I am not familiar enough with the C implementation to tell what Python
> 3.3 actually does, and the PEP assumes a fair amount of familiarity with
> the CPython source. So I welcome corrections.
>
>
>> In fact Python 3.3 uses four kinds of ready strings.
>>
>> * ASCII. All codes <= U+007F.
>> * UCS1. All codes <= U+00FF, at least one code > U+007F.
>> * UCS2. All codes <= U+FFFF, at least one code > U+00FF.
>> * UCS4. All codes <= U+0010FFFF, at least one code > U+FFFF.
>
> Where UCS1 is equivalent to Latin-1, correct?
>
> UCS2 is what Python 3.2 narrow builds uses for all strings, including
> codes > U+FFFF using surrogate pairs.
>
> UCS4 is what Python 3.2 wide builds uses for all strings.
>
> This means that Python 3.3 will no longer have surrogate pairs.

Basically, yes. I believe CPython will only use surrogate code points if 
one requests errors=surrogate-escape on decoding or explicitly puts them 
in a literal (\unnnn or \Ummmmmmmm). The consequences fall under the 
'consenting adults' policy.

-- 
Terry Jan Reedy

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Re: Flexible string representation, unicode, typography, ... Antoine Pitrou <solipsis@pitrou.net> - 2012-08-25 00:24 +0000
  Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-25 00:27 -0700
    Re: Flexible string representation, unicode, typography, ... Ben Finney <ben+python@benfinney.id.au> - 2012-08-25 17:54 +1000
  Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-25 00:27 -0700
    Re: Flexible string representation, unicode, typography, ... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-25 09:58 +0100
    Re: Flexible string representation, unicode, typography, ... Frank Millman <frank@chagford.com> - 2012-08-25 11:46 +0200
      Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-25 08:47 -0700
      Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-25 08:47 -0700
        Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-25 16:26 -0600
          Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-25 23:59 -0700
            Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-26 09:50 -0600
          Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-25 23:59 -0700
            Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-26 11:49 +0000
              Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-26 09:40 -0600
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-26 20:13 +0000
                Re: Flexible string representation, unicode, typography, ... Dan Sommers <dan@tombstonezero.net> - 2012-08-26 13:45 -0700
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-27 12:16 -0700
                Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-27 14:14 -0600
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-27 13:37 -0700
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-29 04:38 -0700
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-29 04:38 -0700
                Re: Flexible string representation, unicode, typography, ... Neil Hodgson <nhodgson@iinet.net.au> - 2012-08-28 09:54 +1000
                Re: Flexible string representation, unicode, typography, ... Chris Angelico <rosuav@gmail.com> - 2012-08-29 13:59 +1000
                Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-28 22:15 -0600
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-29 08:05 +0000
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-29 04:40 -0700
                Re: Flexible string representation, unicode, typography, ... Dave Angel <d@davea.name> - 2012-08-29 08:01 -0400
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-29 08:43 -0700
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-30 06:55 +0000
                Re: Flexible string representation, unicode, typography, ... Chris Angelico <rosuav@gmail.com> - 2012-08-30 18:59 +1000
                Re: Flexible string representation, unicode, typography, ... Roy Smith <roy@panix.com> - 2012-08-30 07:02 -0400
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-30 16:00 +0000
                Re: Flexible string representation, unicode, typography, ... Terry Reedy <tjreedy@udel.edu> - 2012-08-30 16:44 -0400
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-31 12:32 +0000
                Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-31 09:13 -0600
                Re: Flexible string representation, unicode, typography, ... Roy Smith <roy@panix.com> - 2012-08-31 08:43 -0400
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-31 14:54 +0000
                Re: Flexible string representation, unicode, typography, ... Antoine Pitrou <solipsis@pitrou.net> - 2012-08-30 15:01 +0000
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-09-02 00:36 -0700
                Re: Flexible string representation, unicode, typography, ... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-09-02 09:58 +0100
                Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-02 03:06 -0600
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-09-02 11:58 -0700
                Re: Flexible string representation, unicode, typography, ... Michael Torrie <torriem@gmail.com> - 2012-09-02 13:45 -0600
                Re: Flexible string representation, unicode, typography, ... Dave Angel <d@davea.name> - 2012-09-02 16:07 -0400
                Re: Flexible string representation, unicode, typography, ... Terry Reedy <tjreedy@udel.edu> - 2012-09-02 16:38 -0400
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-03 01:42 +0000
                Re: Flexible string representation, unicode, typography, ... Serhiy Storchaka <storchaka@gmail.com> - 2012-09-03 18:26 +0300
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-04 00:53 +0000
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-09-02 11:58 -0700
                Re: Flexible string representation, unicode, typography, ... Peter Otten <__peter__@web.de> - 2012-09-02 11:52 +0200
                Re: Flexible string representation, unicode, typography, ... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-09-02 11:36 +0100
                Re: Flexible string representation, unicode, typography, ... Serhiy Storchaka <storchaka@gmail.com> - 2012-09-02 15:00 +0300
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-09-02 22:39 -0700
                Re: Flexible string representation, unicode, typography, ... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-09-03 07:11 +0100
                Re: Flexible string representation, unicode, typography, ... Peter Otten <__peter__@web.de> - 2012-09-03 08:15 +0200
                Re: Flexible string representation, unicode, typography, ... Terry Reedy <tjreedy@udel.edu> - 2012-09-03 04:38 -0400
                Re: Flexible string representation, unicode, typography, ... Serhiy Storchaka <storchaka@gmail.com> - 2012-09-03 18:56 +0300
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-09-02 22:39 -0700
                Re: Flexible string representation, unicode, typography, ... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-09-02 13:23 +0100
                Re: Flexible string representation, unicode, typography, ... Roy Smith <roy@panix.com> - 2012-09-02 08:35 -0400
                Re: Flexible string representation, unicode, typography, ... Ramchandra Apte <maniandram01@gmail.com> - 2012-09-02 06:48 -0700
                Re: Flexible string representation, unicode, typography, ... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-09-02 15:46 +0100
                Re: Flexible string representation, unicode, typography, ... Ramchandra Apte <maniandram01@gmail.com> - 2012-09-02 06:48 -0700
                Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-03 12:33 -0600
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-09-02 00:36 -0700
                Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-30 10:27 -0600
                Re: Flexible string representation, unicode, typography, ... Serhiy Storchaka <storchaka@gmail.com> - 2012-09-02 23:38 +0300
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-03 01:54 +0000
                Re: Flexible string representation, unicode, typography, ... Terry Reedy <tjreedy@udel.edu> - 2012-09-02 22:33 -0400
                Re: Flexible string representation, unicode, typography, ... Roy Smith <roy@panix.com> - 2012-09-03 11:24 -0400
                Re: Flexible string representation, unicode, typography, ... Serhiy Storchaka <storchaka@gmail.com> - 2012-09-03 18:41 +0300
                Re: Flexible string representation, unicode, typography, ... Serhiy Storchaka <storchaka@gmail.com> - 2012-09-03 00:45 +0300
                Re: Flexible string representation, unicode, typography, ... Chris Angelico <rosuav@gmail.com> - 2012-08-30 01:54 +1000
                Re: Flexible string representation, unicode, typography, ... Chris Angelico <rosuav@gmail.com> - 2012-08-29 22:34 +1000
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-29 04:40 -0700
                Re: Flexible string representation, unicode, typography, ... wxjmfauth@gmail.com - 2012-08-27 12:16 -0700
                Re: Flexible string representation, unicode, typography, ... Ian Kelly <ian.g.kelly@gmail.com> - 2012-08-26 15:42 -0600
                Re: Flexible string representation, unicode, typography, ... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-26 23:31 +0000
                Re: Flexible string representation, unicode, typography, ... Paul Rubin <no.email@nospam.invalid> - 2012-08-26 17:47 -0700
    Re: Flexible string representation, unicode, typography, ... Chris Angelico <rosuav@gmail.com> - 2012-08-25 21:04 +1000
    Re: Flexible string representation, unicode, typography, ... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-25 12:05 +0100
    Re: Flexible string representation, unicode, typography, ... Chris Angelico <rosuav@gmail.com> - 2012-08-25 21:19 +1000
    Re: Flexible string representation, unicode, typography, ... Terry Reedy <tjreedy@udel.edu> - 2012-08-25 07:23 -0400

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