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本文根据pythonspot英文教程编写,并加入了搜集的其他材料，by kowen

首先要引入 QmessageBox类：

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from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMessageBox

然后调用QMessageBox.question()来显示消息窗口。

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import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMessageBox
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot
 
class App(QWidget):
 
    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 messagebox - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 200
        self.initUI()
 
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
 
        buttonReply = QMessageBox.question(self, 'PyQt5 message', "Do you like PyQt5?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
        if buttonReply == QMessageBox.Yes:
            print('Yes clicked.')
        else:
            print('No clicked.')
 
        self.show()
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

效果预览

在弹出消息上显示更多的按钮

传入QMessageBox.Yes和QMessageBox.No可以方便的添加需要的按钮

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buttonReply = QMessageBox.question(self, 'PyQt5 message', "Do you want to save?", QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel, QMessageBox.Cancel)
print(int(buttonReply))
if buttonReply == QMessageBox.Yes:
     print('Yes clicked.')
if buttonReply == QMessageBox.No:
     print('No clicked.')
if buttonReply == QMessageBox.Cancel:
     print('Cancel')

PyQt5提供了丰富的按钮可供选择：
QMessageBox.Cancel QMessageBox.Ok QMessageBox.Help
QMessageBox.Open QMessageBox.Save QMessageBox.SaveAll
QMessageBox.Discard QMessageBox.Close QMessageBox.Apply
QMessageBox.Reset QMessageBox.Yes QMessageBox.YesToAll
QMessageBox.No QMessageBox.NoToAll QMessageBox.NoButton
QMessageBox.RestoreDefaults QMessageBox.Abort QMessageBox.Retry
QMessageBox.Ignore
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