如何同时使用PyQT5表格和菜单？

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

app = QApplication([])
window = QMainWindow()
table = QTableWidget(window)

table.setRowCount(5)
table.setColumnCount(3)

menu = QMenu()
action1 = QAction("菜单项1", window)
action2 = QAction("菜单项2", window)

menu.addAction(action1)
menu.addAction(action2)

table.setContextMenuPolicy(Qt.CustomContextMenu)
table.customContextMenuRequested.connect(lambda pos: menu.exec_(table.mapToGlobal(pos)))

window.setCentralWidget(table)
window.show()
app.exec_()