QTablewidget生成右键菜单，需要自定义一个QTablewidget类

import sys
from PyQt5.QtWidgets import QApplication, QTableWidget, QTableWidgetItem, QMenu, QAction, QDialog
from PyQt5.QtCore import Qt
from PyQt5 import QtCore

class CustomTableWidget(QTableWidget): 
    def __init__(self, parent=None):
        super(CustomTableWidget, self).__init__( parent)
        self.setRowCount(10)
        self.setColumnCount(2)

        # 初始化表格数据
        self.setHorizontalHeaderLabels(['姓名','班别']) #水平标题
        names = ['小天','小米','小云','小月','小芳','小贝','小美','小亮','小欢','小阳']
        classes = ['一班','一班','一班','二班','二班','二班','二班','三班','三班','三班']
        
        i = 0
        for item in names:
            self.setItem(i,0, QTableWidgetItem(item))#添加内容到表格中
            self.setItem(i,1, QTableWidgetItem(classes[i]))
            i += 1
        
        # 创建右键菜单
        self.popup_menu = QMenu(self)
        self.action1 = QAction("显示", self)#生成一个选项
        self.popup_menu.addAction(self.action1)#将选项添加到菜单中

        # 连接动作到槽函数（可选）
        self.action1.triggered.connect(self.on_action1_triggered)

    def mousePressEvent(self, event):#重写mousePressEvent
        if event.button() == Qt.RightButton:
            # 获取点击的单元格位置
            self.row = self.rowAt(event.y())#行
            self.column = self.columnAt(event.x())#列
            super().mousePressEvent(event)#调用父类的mousePressEvent处理其他事件
            
            # 显示右键菜单
            self.popup_menu.exec_(event.globalPos())
        else:
            super().mousePressEvent(event)#调用父类的mousePressEvent处理其他事件

    def on_action1_triggered(self):
        # 菜单选项action1的动作
        print(f"行：{self.row}  列：{self.column}")

if __name__ == '__main__':
    app = QApplication(sys.argv)
    dialog = QDialog()
    dialog.resize(400, 300)
    table = CustomTableWidget(dialog)  # 创建一个表格
    table.setGeometry(QtCore.QRect(70, 50, 256, 192))
    dialog.show()
    sys.exit(app.exec_())

按F5运行，在界面的表格中按右键时，显示菜单

选中显示是，控制台输出选中的行数和列数

QAction的信号