如何根据在PyQt5中的另一个组合框中选择的值更新一个组合框的内容

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QComboBox

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

    def initUI(self):
        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('ComboBox Example')

        combo1 = QComboBox(self)
        combo1.addItem("Option 1")
        combo1.addItem("Option 2")
        combo1.addItem("Option 3")
        combo1.move(50, 50)

        combo2 = QComboBox(self)
        combo2.move(150, 50)

        combo1.currentIndexChanged.connect(self.updateCombo2)

        self.show()

    def updateCombo2(self, index):
        combo2.clear()

        if index == 0:
            combo2.addItem("Option A")
            combo2.addItem("Option B")
            combo2.addItem("Option C")
        elif index == 1:
            combo2.addItem("Option X")
            combo2.addItem("Option Y")
            combo2.addItem("Option Z")
        elif index == 2:
            combo2.addItem("Option I")
            combo2.addItem("Option II")
            combo2.addItem("Option III")

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())