python PyQt子菜单的使用

class Window(QMainWindow):

    # Snip...

    def _createMenuBar(self):

        # Snip...

        editMenu.addAction(self.cutAction)

        # Find and Replace submenu in the Edit menu

        findMenu = editMenu.addMenu("Find and Replace")

        findMenu.addAction("Find...")

        findMenu.addAction("Replace...")

        # Snip...