'Override Qt method'

def dragEnterEvent(self, event):

    mimeData = event.mimeData()
    formats = list(mimeData.formats())
    if (('parent-id' in formats) and (int(mimeData.data('parent-id')) == id(self.ancestor))):
        event.acceptProposedAction()
    QTabBar.dragEnterEvent(self, event)
