  def paintEvent(self, event):     painter = QtGui.QPainter(self)     painter.drawPixmap(self.rect(), self._image)     pen = QtGui.QPen()     pen.setWidth(0)     painter.setPen(pen)     painter.drawEllipse(000, 000, 00, 00)  if __name__ == '__main__':     import sys     app = QtWidgets.QApplication(sys.argv)     w = ImageScroller()     w.resize(000, 000)     w.show()     sys.exit(app.exec_())  