如何在pyqt上创建显示鼠标悬停的侧边栏菜单？

from PyQt5.QtWidgets import QApplication, QMainWindow, QDockWidget, QListWidget, QLabel
from PyQt5.QtCore import Qt

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("侧边栏菜单示例")
        
        # 创建侧边栏菜单
        self.sidebar = QDockWidget("侧边栏", self)
        self.sidebar.setAllowedAreas(Qt.LeftDockWidgetArea | Qt.RightDockWidgetArea)
        self.sidebar.setFeatures(QDockWidget.NoDockWidgetFeatures)
        
        # 创建菜单项列表
        self.menu_list = QListWidget(self.sidebar)
        self.menu_list.addItem("菜单项1")
        self.menu_list.addItem("菜单项2")
        self.menu_list.addItem("菜单项3")
        
        # 设置菜单项悬停事件
        self.menu_list.itemEntered.connect(self.show_tooltip)
        
        # 将侧边栏添加到主窗口
        self.addDockWidget(Qt.LeftDockWidgetArea, self.sidebar)
        
        # 创建内容区域
        self.content = QLabel("内容区域", self)
        self.setCentralWidget(self.content)
        
    def show_tooltip(self, item):
        # 显示菜单项的悬停提示
        tooltip = item.text() + "被悬停"
        QApplication.instance().tooltip = tooltip

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