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需要用到QDesktopWidget

import sysfrom PyQt5.QtWidgets import QMainWindow, QApplication, QDesktopWidgetfrom PyQt5.QtGui import QIconclass CenterForm(QMainWindow):    def __init__(self, parent= None):        super(CenterForm, self).__init__(parent)        #设置窗口标题        self.setWindowTitle('窗口居中显示')        #设置窗口尺寸        self.resize(400,300)    def center(self):        #获取屏幕坐标系        screen = QDesktopWidget().screenGeometry()        #获取窗口坐标系        size = self.geometry()        newleft = (screen.width() - size.width())/2        newtop = (screen.height() - size.height())/2        self.move(newleft, newtop)if __name__ == '__main__':    #创建应用    app = QApplication(sys.argv)    #设置窗口icon    app.setWindowIcon(QIcon('./python.jpg'))    main = CenterForm()    main.show()    app.exit(app.exec_())

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