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Re: Not x.islower() has different output than x.isupper() in list output...

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DFS writes:

> On 5/3/2016 10:49 AM, Jussi Piitulainen wrote:
>> DFS writes:
>>
>>> On 5/3/2016 9:13 AM, Chris Angelico wrote:
>>
>>>> It doesn't invert, the way numeric negation does.
>>>
>>> What do you mean by 'case inverted'?
>>>
>>> It looks like it swaps the case correctly between upper and lower.
>>
>> There's letters that do not come in exact pairs of upper and lower case,
>> so _some_ swaps are not invertible: you swap twice and end up somewhere
>> else than your starting point.
>>
>> The "\N{ANSGTROM SIGN}" looks like the Swedish upper-case
>> a-with-ring-above but isn't the same character, yet Python swaps its
>> case to the actual lower-case a-with-ring above. It can't go back to
>> _both_ the Angstrom sign and the actual upper case letter.
>>
>> (Not sure why the sign is considered a cased letter at all.)
>
>
> Thanks for the explanation.
>
> Does that mean:
>
> lower(Å) != å ?
>
> and
>
> upper(å) != Å ?

It means "\N{ANGSTROM SIGN}" != "Å", yet both lower to "å", which then
uppers back to "Å" (U+00c5).

The Ångström sign (U+212b) looks like this: Å. Indistinguishable from Å
in the font that I'm seeing - for all I know, it's the same glyph.

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Re: Not x.islower() has different output than x.isupper() in list output... Christopher Reimer <christopher_reimer@icloud.com> - 2016-04-29 18:55 -0700
  Re: Not x.islower() has different output than x.isupper() in list   output... Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-04-30 17:47 +1200
  Re: Not x.islower() has different output than x.isupper() in list output... pavlovevidence@gmail.com - 2016-05-03 03:00 -0700
    Re: Not x.islower() has different output than x.isupper() in list output... Chris Angelico <rosuav@gmail.com> - 2016-05-03 20:25 +1000
      Re: Not x.islower() has different output than x.isupper() in list output... Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-05-03 14:25 +0300
        Re: Not x.islower() has different output than x.isupper() in list output... Chris Angelico <rosuav@gmail.com> - 2016-05-03 22:00 +1000
          Re: Not x.islower() has different output than x.isupper() in list output... DFS <nospam@dfs.com> - 2016-05-03 09:01 -0400
            Re: Not x.islower() has different output than x.isupper() in list output... Chris Angelico <rosuav@gmail.com> - 2016-05-03 23:13 +1000
              Re: Not x.islower() has different output than x.isupper() in list output... DFS <nospam@dfs.com> - 2016-05-03 09:19 -0400
                Re: Not x.islower() has different output than x.isupper() in list output... Chris Angelico <rosuav@gmail.com> - 2016-05-03 23:23 +1000
                Re: Not x.islower() has different output than x.isupper() in list output... Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-05-03 17:49 +0300
                Re: Not x.islower() has different output than x.isupper() in list output... DFS <nospam@dfs.com> - 2016-05-03 11:12 -0400
                Re: Not x.islower() has different output than x.isupper() in list output... Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-05-03 18:27 +0300
                Re: Not x.islower() has different output than x.isupper() in list output... Grant Edwards <grant.b.edwards@gmail.com> - 2016-05-03 15:42 +0000
                Re: Not x.islower() has different output than x.isupper() in list output... Terry Reedy <tjreedy@udel.edu> - 2016-05-03 12:37 -0400
                Re: Not x.islower() has different output than x.isupper() in list output... Steven D'Aprano <steve@pearwood.info> - 2016-05-04 13:28 +1000
                Re: Not x.islower() has different output than x.isupper() in list output... DFS <nospam@dfs.com> - 2016-05-04 10:09 -0400
                Re: Not x.islower() has different output than x.isupper() in list output... Chris Angelico <rosuav@gmail.com> - 2016-05-05 00:37 +1000
                Re: Not x.islower() has different output than x.isupper() in list output... Steven D'Aprano <steve@pearwood.info> - 2016-05-05 01:37 +1000
                Re: Not x.islower() has different output than x.isupper() in list output... DFS <nospam@dfs.com> - 2016-05-04 17:05 -0400
          Re: Not x.islower() has different output than x.isupper() in list output... Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-05-03 17:42 +0300
            Re: Not x.islower() has different output than x.isupper() in list output... Steven D'Aprano <steve@pearwood.info> - 2016-05-04 11:30 +1000
            Re: Not x.islower() has different output than x.isupper() in list output... Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-05-04 20:34 +1200
              Re: Not x.islower() has different output than x.isupper() in list output... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-05-04 19:06 +1000

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