PyQt5-关闭窗体显示提示框（窗口界面显示器上居中）-5

 1 import sys
 2 from PyQt5.QtWidgets import QApplication, QWidget,QToolTip,QPushButton,QMessageBox,QDesktopWidget
 3 from PyQt5.QtGui import QIcon,QFont
 4 from PyQt5.QtCore import QCoreApplication
 5 
 6 #demo_5:重新关闭按钮x关闭事件，给个提示框提示
 7 class Exception(QWidget):
 8     def __init__(self):
 9         super().__init__()
10         self.initUI()
11 
12     def initUI(self):
13         self.setWindowTitle('添加关闭按钮')
14         self.setFont(QFont('微软雅黑',20))
15         self.resize(400,300)
16         self.setWindowIcon(QIcon('1.png'))
17 
18         #居中窗口
19         qr = self.frameGeometry()
20         cp = QDesktopWidget().availableGeometry().center()
21         qr.moveCenter(cp)
22         self.move(qr.topLeft())
23 
24         self.show()
25 
26     def closeEvent(self, QCloseEvent):
27         res=QMessageBox.question(self,'消息','是否关闭这个窗口？',QMessageBox.Yes|QMessageBox.No,QMessageBox.No) #两个按钮是否， 默认No则关闭这个提示框
28         if res==QMessageBox.Yes:
29             QCloseEvent.accept()  
30         else:
31             QCloseEvent.ignore()
32 
33 
34 
35 if __name__=='__main__':
36     pp=QApplication(sys.argv)
37     example=Exception()
38     #example.show()
39     sys.exit(pp.exec())