将组合框中的选定项连接到pyqt5中的行

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QComboBox, QLineEdit

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.combo_box = QComboBox(self)
        self.combo_box.addItem("Option 1")
        self.combo_box.addItem("Option 2")
        self.combo_box.addItem("Option 3")
        self.combo_box.currentIndexChanged.connect(self.update_line_edit)

        self.line_edit = QLineEdit(self)

    def update_line_edit(self, index):
        selected_option = self.combo_box.currentText()
        self.line_edit.setText(selected_option)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())