Ok, i have been using this format because it is more compact and a bit faster
but i will change my code, any other qt classes that have added lately a
__len__() method? From what version can i account this changes? Thanks for the info.
Regards,
Miguel Angel.
El 01/08/10 23:34, Phil Thompson escribió:
On Sun, 01 Aug 2010 19:49:11 +0200, Linos<[email protected]> wrote:
Hello,
i don't know if this is a bug or an intended behavior but i am using in
my
machine Arch Linux pyqt 4.7.4 with sip 4.10.5 and in older versions the
behavior
was:
combo = QComboBox()
if combo:
print "exists"
else:
print "is none"
would print "exists" and now it prints "is none", i suppose it is a bug
because
the same test with QLabel still print "exists", i have not tested other
classes
though.
It's a side effect of an intended change that is triggering a bug in your
code.
QComboBox() now has a __len__() method which changes the behaviour of "if
combo".
If you want to test for None then you should always do so explicitly...
if combo is None:
print "is none"
else:
print "exists"
Phil
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