[PyKDE] False Attribute Errors

Phil Thompson phil at riverbankcomputing.co.uk
Mon Feb 7 07:36:37 GMT 2005

On Monday 07 February 2005 4:02 am, bdw wrote:
> After I installed the latest snapshots recently, I started getting what
> seem to be false Attribute Errors. The problem affects Qt objects which
> I have added properties to like this:
>     class MyCustomWidget(QWidget):
>         def __init__(self, parent):
>             QWidget.__init__(self, parent)
>             self.newProperty = 1
> If I insert blocks of asserts like this at various places,
>     assert hasattr(mywidget,'className')
>     assert hasattr(mywidget,'geometry')
>     assert hasattr(mywidget,'newProperty')
> only the last one ever gives an Attribute Error. That is, the QObject
> and QWidget attributes are okay, but not the Python one. The crazy
> thing is, it doesn't happen all the time or even in the same sections
> of code - so I can't really give any specific samples.
> The problem occurs with the following set up:
>     sip-20050129, pyqt-20050129, qscintilla-20050122
>     python-2.4, qt-3.2.3
> I also re-compiled everything using the 20050204 sip snapshot, but it
> didn't change anything.
> Has anyone else seen this kind of thing? Any help at all would be
> welcome as this has really got me stumped!

I think it's a SIP bug - you'll probably find that the type of mywidget is not 
what you expect when the AttributeError is raised. It's the one thing that's 
holding up the release of SIP 4.2.


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