On Fri, 29 Nov 2013 21:28:47 -0500, Roy Smith <r...@panix.com> wrote:
In article <mailman.3417.1385777557.18130.python-l...@python.org>,
Chris Angelico <ros...@gmail.com> wrote:
> On Sat, Nov 30, 2013 at 1:08 PM, Roy Smith <r...@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
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