PyQt如何防止将鼠标悬停在QMenu上以清除Qstatusbar？

from PyQt5.QtWidgets import QApplication, QMainWindow, QMenu, QAction, QStatusBar
from PyQt5.QtCore import Qt

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.statusBar().showMessage('Ready')

        menu = QMenu(self)
        clearAction = QAction('Clear Status Bar', self)
        menu.addAction(clearAction)

        menu.aboutToShow.connect(self.clearStatusBar)

        self.menuBar().addMenu(menu)

        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('QMenu Example')
        self.show()

    def clearStatusBar(self):
        self.statusBar().clearMessage()

if __name__ == '__main__':
    app = QApplication([])
    window = MainWindow()
    app.exec_()