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

Groups > comp.lang.python > #50936

Re: Share Code Tips

Show key headers only | View raw

On 07/19/2013 07:09 PM, Dave Angel wrote:
> On 07/19/2013 06:08 PM, Devyn Collier Johnson wrote:
>>
>> On 07/19/2013 01:59 PM, Steven D'Aprano wrote:
>
>      <snip>
>>
>> As for the case-insensitive if-statements, most code uses Latin letters.
>> Making a case-insensitive-international if-statement would be
>> interesting. I can tackle that later. For now, I only wanted to take
>> care of Latin letters. I hope to figure something out for all 
>> characters.
>>
>
> Once Steven gave you the answer, what's to figure out?  You simply use 
> casefold() instead of lower().  The only constraint is it's 3.3 and 
> later, so you can't use it for anything earlier.
>
> http://docs.python.org/3.3/library/stdtypes.html#str.casefold
>
> """
> str.casefold()
> Return a casefolded copy of the string. Casefolded strings may be used 
> for caseless matching.
>
> Casefolding is similar to lowercasing but more aggressive because it 
> is intended to remove all case distinctions in a string. For example, 
> the German lowercase letter 'ß' is equivalent to "ss". Since it is 
> already lowercase, lower() would do nothing to 'ß'; casefold() 
> converts it to "ss".
>
> The casefolding algorithm is described in section 3.13 of the Unicode 
> Standard.
>
> New in version 3.3.
> """
>
Chris Angelico said that casefold is not perfect. In the future, I want 
to make the perfect international-case-insensitive if-statement. For 
now, my code only supports a limited range of characters. Even with 
casefold, I will have some issues as Chris Angelico mentioned. Also, "ß" 
is not really the same as "ss".

Mahalo,
DCJ

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

Thread

Share Code Tips Devyn Collier Johnson <devyncjohnson@gmail.com> - 2013-07-19 09:51 -0400
  Re: Share Code Tips Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-19 17:59 +0000
    Re: Share Code Tips Devyn Collier Johnson <devyncjohnson@gmail.com> - 2013-07-19 18:08 -0400
      Re: Share Code Tips Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-20 03:18 +0000
        Re: Share Code Tips Devyn Collier Johnson <devyncjohnson@gmail.com> - 2013-07-20 06:07 -0400
    Re: Share Code Tips Chris Angelico <rosuav@gmail.com> - 2013-07-20 09:08 +1000
    Re: Share Code Tips Dave Angel <davea@davea.name> - 2013-07-19 19:09 -0400
    Re: Share Code Tips Devyn Collier Johnson <devyncjohnson@gmail.com> - 2013-07-19 21:04 -0400
      Re: Share Code Tips Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-20 03:44 +0000
        Re: Share Code Tips David Hutto <dwightdhutto@gmail.com> - 2013-07-20 00:15 -0400
        Re: Share Code Tips David Hutto <dwightdhutto@gmail.com> - 2013-07-20 00:22 -0400
        Re: Share Code Tips David Hutto <dwightdhutto@gmail.com> - 2013-07-20 00:26 -0400
        Re: Share Code Tips David Hutto <dwightdhutto@gmail.com> - 2013-07-20 00:27 -0400
        Re: Share Code Tips Devyn Collier Johnson <devyncjohnson@gmail.com> - 2013-07-20 06:10 -0400
        Re: Share Code Tips Devyn Collier Johnson <devyncjohnson@gmail.com> - 2013-07-20 08:36 -0400
    Re: Share Code Tips Chris Angelico <rosuav@gmail.com> - 2013-07-20 11:13 +1000
    Re: Share Code Tips Dave Angel <davea@davea.name> - 2013-07-19 21:51 -0400
    Re: Share Code Tips David Hutto <dwightdhutto@gmail.com> - 2013-07-19 23:42 -0400
    Re: Share Code Tips Devyn Collier Johnson <devyncjohnson@gmail.com> - 2013-07-20 06:06 -0400
    Re: Share Code Tips Devyn Collier Johnson <devyncjohnson@gmail.com> - 2013-07-20 08:20 -0400

csiph-web