[PyKDE] strange problems with lxml and PyQt4

[Phil Thompson]

On Thursday 12 January 2006 1:57 am, Andreas Pakulat wrote:
> Hi,
>
> following Traceback:
>
> Traceback (most recent call last):
>   File
> "/home/andreas/projects/pyfilmdbsimpleui/widgets/pictureformatwidget.py",
> line 105, in on_removePictureFormat_clicked model.removeRows(index.row(),
> 1, index.parent())
>   File
> "/home/andreas/projects/pyfilmdbsimpleui/widgets/generaltablemodel.py",
> line 77, in removeRows del self.datalist[row:row+count]
>   File "etree.pyx", line 354, in etree._Element.__delslice__
> NotImplementedError: QAbstractItemModel.parent() is abstract and must be
> overridden
>
>
> with the following implemenation:
>
>     def removeRows(self, row, count, parent = QtCore.QModelIndex()):
>         if not self.datalist or len(self.datalist) < count:
>             return False
>         self.beginRemoveRows(QtCore.QModelIndex(), row, count+row-1)
>         del self.datalist[row:row+count]
>         self.endRemoveRows()
>         return True
>
> self is a subclass of QAbstractItemModel.
> self.datalist is an element of a XML tree created by lxml
>
> What am I doing wrong here?
>
> Something similar happens when I insert rows via insertRows function:
>
>     def insertRows(self, row, count, parent = QtCore.QModelIndex()):
>         if not self.datalist:
>             return False
>
>         self.beginInsertRows( parent, row, count+row-1)
>         for i in range(0, count):
>             self.datalist.insert(row+i, common.buildElement(self.datalist,
> self.elementname)) self.endInsertRows()
>         return True
>
> The really strange thing with insert is: It works if in the List nothing
> is selected but I get a traceback similar to the one above when I first
> select an item.
>
> Oh and the methods that call insertRows and removeRows are:
>
>     def on_removePictureFormat_clicked(self):
>         list = self.pictureFormats.selectionModel().selectedIndexes()
>         model = self.pictureFormats.model()
>         for index in list:
>             model.removeRows(index.row(), 1, index.parent())
>
>     def on_addPictureFormat_clicked(self):
>        
> self.pictureFormats.model().insertRows(self.pictureFormats.model().rowCount
>(), 1)
>
> Hope somebody has a hint for me.

You need to post a short, but complete, example that demonstrates the problem. 
When people select code fragments to post, but can't find the error, its 
usually because they are looking in the wrong place.

Phil