[PyQt] Question about drawing background images in a QGraphicsScene and QGraphicsView

[dizou]

I have a QGraphicsScene and a QGraphicsView. I am currently using the
QGraphicsView to draw a backgorund image. I have reimplemented the
QGraphicsView::drawBackground() function like this:

def drawBackground(self, painter, rect):
        sceneRect = self.sceneRect()
        if self.background:
            rectf = QRectF(self.background.rect())
            painter.drawPixmap(sceneRect, self.background, rectf)
        else:
            painter.fillRect(rect.intersect(sceneRect),
QBrush(Qt.lightGray))
            painter.setBrush(Qt.NoBrush)
            painter.drawRect(sceneRect)

self.background is a QPixmap: 
self.background = QPixmap(':/some_image.png')
The problem with this is that if the PNG is not in my .qrc file, the
background image does not show up. I would like to make it so that I can use
any image I want without having to put it into the .qrc. How would I do
this?

I took a look at QGraphicsScene::drawBackground() which requires a QPainter
as a parameter. However, I am not sure of how to tell the QPainter which
image to use.
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