[PyQt] Re: Bug in QString comparison
rasky at develer.com
Wed Sep 17 23:33:38 BST 2008
On mar, 2008-09-16 at 21:54 +0100, Phil Thompson wrote:
> On Wed, 10 Sep 2008 01:51:54 +0200, Giovanni Bajo <rasky at develer.com>
> > Hello Phil,
> > this looks weird to me (using sip 4.7.6, PyQt 4.4.2, Qt 4.4.0):
> > =======================================
> > $ python
> > Python 2.5.2 (r252:60911, May 7 2008, 15:21:12)
> > [GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.
> >>>> from PyQt4.Qt import *
> >>>> "a" == QString("a")
> > True
> >>>> u"a" == QString(u"a")
> > True
> >>>> a = u"\u30b5"
> >>>> b = QString(a)
> >>>> a
> > u'\u30b5'
> >>>> b
> > PyQt4.QtCore.QString(u'\u30b5')
> >>>> a == b
> > False
> > ========================================
> > Why does the equality operator returns False?
> a is converting b to a string because QString supports the buffer protocol.
> That conversion is done using the default codec which is normally ascii. If
> QString didn't support the buffer protocol then I think Python would then
> go on to try b == a, which would work.
> b == a works as expected because b is converting a to a QString first.
I would say that this can't possibly be a feature. Before I begin with
random suggestions on how to fix it, maybe you already have an idea?
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