右键菜单

   def Right_click(self,pos):
        row_num = -1
        for i in self.tableWidget.selectionModel().selection().indexes():
            row_num = i.row()
        # if row_num <2:
            menu = QMenu()
        item1 = menu.addAction(u"选项一")
        item2 = menu.addAction(u"选项二")
        item3 = menu.addAction(u"选项三")
        action = menu.exec_(self.tableWidget.mapToGlobal(pos))
        if action == item1:
            txt = self.tableWidget.item(row_num,0).text(),self.tableWidget.item(row_num,1).text(),self.tableWidget.item(row_num,2)
            print(txt)