hello-qt.py

from PySide6.QtWidgets import QApplication, QMainWindow, QMessageBox, QPushButton
from PySide6.QtCore import Qt
import sys

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QT Test")
        button = QPushButton("Test Dialog")
        button.clicked.connect(self.button_click)
        self.setCentralWidget(button)

    def button_click(self):
        msgBox = QMessageBox(self)
        msgBox.setIcon(QMessageBox.Question)
        msgBox.setText("Quit?")
        msgBox.setStandardButtons(QMessageBox.Save | QMessageBox.Discard | QMessageBox.Cancel)
        result = msgBox.exec()
        match result:
                case QMessageBox.Save:
                        print("Save")
                case QMessageBox.Discard:
                        print("Discard")
                case QMessageBox.Cancel:
                        print("Cancel")
        return True

app = QApplication(sys.argv)

window = MainWindow()
window.show()
app.exec()