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To: python-list@python.org
From: Dave Angel <davea@davea.name>
Subject: Re: Python Unicode handling wins again -- mostly
Date: Fri, 29 Nov 2013 22:06:21 -0500
References: <529934dc$0$29993$c3e8da3$5496439d@news.astraweb.com> <roy-89763C.21084929112013@news.panix.com> <mailman.3417.1385777557.18130.python-list@python.org> <roy-F25011.21284729112013@news.panix.com>
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On Fri, 29 Nov 2013 21:28:47 -0500, Roy Smith <roy@panix.com> wrote:
> In article <mailman.3417.1385777557.18130.python-list@python.org>,
>  Chris Angelico <rosuav@gmail.com> wrote:
> > On Sat, Nov 30, 2013 at 1:08 PM, Roy Smith <roy@panix.com> wrote:
> > > I would certainly expect, x.lower() == x.upper().lower(), to be 
True for
> > > all values of x over the set of valid unicode codepoints.  
Having
> > > u"\uFB04".upper() ==> "FFL" breaks that.  I would also expect 
len(x) ==
> > > len(x.upper()) to be True.

> > That's a nice theory, but the Unicode consortium disagrees with 
you on
> > both points.

And they were already false long before Unicode.  I don’t know 
specifics but there are many cases where there are no uppercase 
equivalents for a particular lowercase character.  And others where 
the uppercase equivalent takes multiple characters.

-- 
DaveA