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

Groups > comp.lang.python > #77615

Re: How to turn a string into a list of integers?

Show key headers only | View raw

Am 05.09.2014 um 21:16 schrieb Kurt Mueller <kurt.alfred.mueller@gmail.com>:
> Am 05.09.2014 um 20:25 schrieb Chris “Kwpolska” Warrick <kwpolska@gmail.com>:
>> On Sep 5, 2014 7:57 PM, "Kurt Mueller" <kurt.alfred.mueller@gmail.com> wrote:
>>> Could someone please explain the following behavior to me:
>>> Python 2.7.7, MacOS 10.9 Mavericks
>>> 
>>>>>> import sys
>>>>>> sys.getdefaultencoding()
>>> 'ascii'
>>>>>> [ord(c) for c in 'AÄ']
>>> [65, 195, 132]
>>>>>> [ord(c) for c in u'AÄ']
>>> [65, 196]
>>> 
>>> My obviously wrong understanding:
>>> ‚AÄ‘ in ‚ascii‘ are two characters
>>>     one with ord A=65 and
>>>     one with ord Ä=196 ISO8859-1 <depends on code table>
>>>     —-> why [65, 195, 132]
>>> u’AÄ’ is an Unicode string
>>>     —-> why [65, 196]
>>> 
>>> It is just the other way round as I would expect.
>> 
>> Basically, the first string is just a bunch of bytes, as provided by your terminal — which sounds like UTF-8 (perfectly logical in 2014).  The second one is converted into a real Unicode representation. The codepoint for Ä is U+00C4 (196 decimal). It's just a coincidence that it also matches latin1 aka ISO 8859-1 as Unicode starts with all 256 latin1 codepoints. Please kindly forget encodings other than UTF-8.
> 
> So:
> ‘AÄ’ is an UTF-8 string represented by 3 bytes:
> A -> 41   -> 65  first byte decimal
> Ä -> c384 -> 195 and 132 second and third byte decimal
> 
> u’AÄ’ is an Unicode string represented by 2 bytes?:
> A -> U+0041 -> 65 first byte decimal, 00 is omitted or not yielded by ord()?
> Ä -> U+00C4 -> 196 second byte decimal, 00 is ommited or not yielded by ord()?

After reading the ord() manual:
The second case should read:
u’AÄ’ is an Unicode string represented by 2 unicode characters:
If Python was built with UCS2 Unicode, then the character’s code point must
be in the range [0..65535, 16 bits, U-0000..U-FFFF]
A -> U+0041 ->  65 first  character decimal (code point)
Ä -> U+00C4 -> 196 second character decimal (code point)


Am I right now?

-- 
Kurt Mueller, kurt.alfred.mueller@gmail.com

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

How to turn a string into a list of integers? cl@isbd.net - 2014-09-03 13:27 +0100
  Re: How to turn a string into a list of integers? Peter Otten <__peter__@web.de> - 2014-09-03 14:52 +0200
    Re: How to turn a string into a list of integers? cl@isbd.net - 2014-09-03 15:48 +0100
      Re: How to turn a string into a list of integers? Joshua Landau <joshua@landau.ws> - 2014-09-04 22:06 +0100
        Re: How to turn a string into a list of integers? cl@isbd.net - 2014-09-05 09:42 +0100
          Re: How to turn a string into a list of integers? Kurt Mueller <kurt.alfred.mueller@gmail.com> - 2014-09-05 19:56 +0200
            Re: How to turn a string into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-06 15:47 +1000
              Re: How to turn a string into a list of integers? Peter Otten <__peter__@web.de> - 2014-09-06 10:22 +0200
                Re: How to turn a string into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-06 21:17 +1000
              Re: How to turn a string into a list of integers? Kurt Mueller <kurt.alfred.mueller@gmail.com> - 2014-09-06 14:15 +0200
                Re: How to turn a string into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-07 04:19 +1000
                Re: How to turn a string into a list of integers? Kurt Mueller <kurt.alfred.mueller@gmail.com> - 2014-09-06 21:28 +0200
                Re: How to turn a string into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-07 11:47 +1000
                Re: How to turn a string into a list of integers? MRAB <python@mrabarnett.plus.com> - 2014-09-07 15:52 +0100
                Re: How to turn a string into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-08 03:02 +1000
                Re: How to turn a string into a list of integers? Rustom Mody <rustompmody@gmail.com> - 2014-09-07 10:53 -0700
                Re: How to turn a string into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-08 04:08 +1000
                Re: How to turn a string into a list of integers? Rustom Mody <rustompmody@gmail.com> - 2014-09-07 11:34 -0700
                Re: How to turn a string into a list of integers? Chris Angelico <rosuav@gmail.com> - 2014-09-08 10:14 +1000
                Re: How to turn a string into a list of integers? Marko Rauhamaa <marko@pacujo.net> - 2014-09-08 08:44 +0300
                Re: How to turn a string into a list of integers? Chris Angelico <rosuav@gmail.com> - 2014-09-08 15:53 +1000
                Re: How to turn a string into a list of integers? Terry Reedy <tjreedy@udel.edu> - 2014-09-08 03:41 -0400
                Re: How to turn a string into a list of integers? Chris Angelico <rosuav@gmail.com> - 2014-09-08 01:04 +1000
                Re: How to turn a string into a list of integers? Roy Smith <roy@panix.com> - 2014-09-07 11:40 -0400
                Re: How to turn a string into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-08 04:00 +1000
                Re: How to turn a string into a list of integers? Chris Angelico <rosuav@gmail.com> - 2014-09-08 10:12 +1000
              Re: How to turn a string into a list of integers? Chris Angelico <rosuav@gmail.com> - 2014-09-06 22:23 +1000
          Re: How to turn a string into a list of integers? Chris “Kwpolska” Warrick <kwpolska@gmail.com> - 2014-09-05 20:25 +0200
          Re: How to turn a string into a list of integers? Kurt Mueller <kurt.alfred.mueller@gmail.com> - 2014-09-05 21:16 +0200
          Re: How to turn a string into a list of integers? Kurt Mueller <kurt.alfred.mueller@gmail.com> - 2014-09-05 22:41 +0200
      Re: How to turn a string into a list of integers? Chris Angelico <rosuav@gmail.com> - 2014-09-05 10:12 +1000
      Re: How to turn a string into a list of integers? Ian Kelly <ian.g.kelly@gmail.com> - 2014-09-04 20:09 -0600
      Re: How to turn a string into a list of integers? Chris Angelico <rosuav@gmail.com> - 2014-09-05 12:15 +1000
        Re: How to turn a string into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-06 14:27 +1000
  Re: How to turn a string into a list of integers? obedrios@gmail.com - 2014-09-03 07:30 -0700

csiph-web