Terry Reedy wrote:
John Machin wrote:
On Jan 17, 9:07 am, MRAB <goo...@mrabarnett.plus.com> wrote:
Python 2.6.1
I've just found that the following 4 Unicode characters/codepoints don't
behave as I'd expect: Dž (U+01C5), Lj (U+01C8), Nj (U+01CB), Dz (U+01F2).
For example, u"\u01C5".istitle() returns True and
unicodedata.category(u"\u01C5") returns "Lt", but u"\u01C5".title()
returns u'\u01C4', which is the uppercase equivalent. Are these mistakes
in the Unicode database?
Doesn't look like it. AFAICT it's a mistake in Objects/unicodetype.c,
function _PyUnicode_ToTitlecase.
See
http://svn.python.org/view/python/trunk/Objects/unicodectype.c?rev=66362&view=markup
The code that says:
if (ctype->title)
delta = ctype->title;
else
delta = ctype->upper;
should IMHO merely be:
delta = ctype->title;
A value of zero for ctype->title should be interpreted simply as the
offset to add to the ordinal, as it is in the sibling _PyUnicode_To
(Upper|Lower)case functions. See also Tools/unicode/makeunicodedata.py
which treats upper, lower and title identically when preparing the
tables used by those 3 functions.
AFAICT making that change will fix the problem for those four
characters and not ruin any others.
The error that you noticed occurs as far back as I've looked (2.1) and
also occurs in 3.0.
Please post a report to the tracker at bugs.python.org.
Already done: http://bugs.python.org/issue4971
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