当值更改时,获取QComboBox的先前值,该值位于QTableWidget中

from PyQt5.QtWidgets import QApplication, QComboBox, QTableWidget, QTableWidgetItem, QWidget, QVBoxLayout
from PyQt5.QtCore import Qt

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        layout = QVBoxLayout()

        # 创建QComboBox和QTableWidget
        self.comboBox = QComboBox()
        self.tableWidget = QTableWidget()

        # 添加选项到QComboBox
        self.comboBox.addItem("Option 1")
        self.comboBox.addItem("Option 2")
        self.comboBox.addItem("Option 3")

        # 连接valueChanged信号到槽函数
        self.comboBox.currentIndexChanged.connect(self.onComboBoxValueChanged)

        # 设置QTableWidget的行数和列数
        self.tableWidget.setRowCount(3)
        self.tableWidget.setColumnCount(1)

        # 设置QTableWidget的单元格内容
        self.tableWidget.setItem(0, 0, QTableWidgetItem("Value 1"))
        self.tableWidget.setItem(1, 0, QTableWidgetItem("Value 2"))
        self.tableWidget.setItem(2, 0, QTableWidgetItem("Value 3"))

        layout.addWidget(self.comboBox)
        layout.addWidget(self.tableWidget)

        self.setLayout(layout)

    def onComboBoxValueChanged(self, index):
        # 获取先前的值
        previousValue = self.tableWidget.item(index, 0).text()
        print("Previous value:", previousValue)

if __name__ == '__main__':
    app = QApplication([])
    widget = MyWidget()
    widget.show()
    app.exec_()