def writeSettings(self):
    self.settings = QSettings("Moose Soft", "Clipper")
    self.settings.beginGroup("MainWindow")
    self.settings.setValue("size", self.size())
    self.settings.setValue("pos", self.pos())
    self.settings.endGroup()

def readSettings(self):
    self.settings = QSettings("Moose Soft", "Clipper")
    self.settings.beginGroup("MainWindow")
    self.resize(settings.value("size", QSize(400, 400)).toSize())
    self.move(settings.value("pos", QPoint(200, 200)).toPoint())
    self.settings.endGroup()