无法在QListview上添加自定义上下文菜单

Question

我试图在QListView上添加自定义上下文菜单，但没有成功。

我的密码被打击

class Ui_MainWindow(object):
    def OpenNssetup(self):
        self.window = QtWidgets.QDialog()
        self.ui = Ui_nssetup()
        self.ui.setupUi(self.window)
        self.window.show()

    def OpenDBsetup(self):
        self.window = QtWidgets.QDialog()
        self.ui = Ui_Connections()
        self.ui.setupUi(self.window)
        self.window.show() 

    def CloseApp(self):
        sys.exit(0)

    def dbconcontextmenu(self,event):

        # Create a menu
        contextMenu = QMenu(self)
        conAct = contextMenu.addAction("Connect")
        contestAct = contextMenu.addAction("Test Connection")
        condiscAct = contextMenu.addAction("Disconnect")

        action = contextMenu.exec_(self.mapToGlobal(event.pos()))

运行代码时出现以下错误。

Traceback (most recent call last):
  File "mainwindow3.py", line 33, in dbconcontextmenu
    contextMenu = QMenu(self)
TypeError: arguments did not match any overloaded call:
  QMenu(parent: QWidget = None): argument 1 has unexpected type 'Ui_MainWindow'
  QMenu(str, parent: QWidget = None): argument 1 has unexpected type 'Ui_MainWindow'