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[Python-Dev] unicode inconsistency?

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Neil Schemenauer wrote:> On Wed, Mar 09, 2005 at 11:10:59AM +0100, M.-A. Lemburg wrote:>>>The patch implements the PyObjbect_Text() idea (an API that>>returns a basestring instance, ie. string or unicode) and>>then uses this in '%s' (the string version) to properly propogate>>to u'%s' (the unicode version).>>>>Maybe we should also expose the C API as suggested in the patch,>>e.g. as text(obj).>>> Perhaps the right thing to do is introduce a new format code that> means insert text(obj) instead of str(obj), e.g %t.  If we do that> though then we should make "'%s' % u'xyz'" return a string instead of> a unicode object.  I suspect that would break a lot of code.It would result in lots of UnicodeErrors due to failingconversion of the Unicode string to a string. Plus itwould break with the general rule of always coercing toUnicode (see below) and lose us the ability to writepolymorphic code.> OTOH, having %s mean text(obj) instead of str(obj) may work just> fine.  People who want it to mean str() generally don't have any> unicode strings floating around so text() has the same effect.> People who are using unicode probably would find text() to be more> useful behavior.  I think that's why someone hacked PyString_Format> to sometimes return unicode strings.That wasn't a hack: it's part of the Unicode integration logicwhich always coerces to Unicode if strings and Unicode meet. Inthe above case a string format string meets a Unicode object asargument which then results in a Unicode object to be returned.> Regarding the use of  __str__, to return a unicode object: we could> introduce a new slot (e.g. __text__) instead.  However, I can't see> any advantage to that.  If someone really wants a str object then> they call str() or PyObject_Str().Right.-- Marc-Andre LemburgeGenix.comProfessional Python Services directly from the Source  (#1, Mar 09 2005) >>> Python/Zope Consulting and Support ...http://www.egenix.com/ >>> mxODBC.Zope.Database.Adapter ...http://zope.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ...http://python.egenix.com/________________________________________________________________________::: Try mxODBC.Zope.DA for Windows,Linux,Solaris,FreeBSD for free ! ::::

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