如何在PyQT5对话框窗口中记录按下的组合键

from PyQt5.QtWidgets import QDialog, QApplication
from PyQt5.QtGui import QKeyEvent

class MyDialog(QDialog):
    def __init__(self):
        super().__init__()

    def keyPressEvent(self, event):
        if event.modifiers() & Qt.ControlModifier and event.key() == Qt.Key_A:
            print("Ctrl + A pressed")
        elif event.modifiers() & Qt.ShiftModifier and event.key() == Qt.Key_B:
            print("Shift + B pressed")
        elif event.modifiers() & Qt.AltModifier and event.key() == Qt.Key_C:
            print("Alt + C pressed")
        else:
            super().keyPressEvent(event)

if __name__ == '__main__':
    app = QApplication([])
    dialog = MyDialog()
    dialog.show()
    app.exec_()