[PyQt] Getting a SystemError: error return without exception set when I try to do QGraphicsScene.addItem(QGraphicsItem)

[Phil Thompson]

On Fri, 11 Dec 2009 10:15:19 -0800 (PST), dizou <di_zou at yahoo.com> wrote:
> I have a widget that creates two objects, DisplayScene and DisplayView.
> DisplayScene inherits from the QGraphicsScene class, and DisplayView
> inherits from the QGraphicsView class. I also have MyItem that inherits
> from
> the QGraphicsItem class. When I run this program and the
DisplayScene.Read
> method is called I create a MyItem object and I try to add it to the
> DisplayScene. When I do this I get this error:
> SystemError: error return without exception set
> 
> Here is my code:
> 
> class MainWidget(QWidget):
>     def __init__(self):
>         QWidget.__init__(self)
>         
>         self.display = DisplayScene(self)
>         self.view = DisplayView(self.display)
>         self.view.show()
>         self.display.Read()
> 
> class MyItem(QTreeWidgetItem, QGraphicsItem):
>     def __init__(self, parent=None):
>         QTreeWidgetItem.__init__(self, parent)
>         QGraphicsItem.__init__(self)

You can't multiply inherit from two wrapped classes.

Phil