如何在pyqt5中获得切换值？

from PyQt5.QtWidgets import QApplication, QMainWindow, QCheckBox
from PyQt5.QtCore import Qt

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

        self.checkbox = QCheckBox("切换值", self)
        self.checkbox.stateChanged.connect(self.on_checkbox_changed)

    def on_checkbox_changed(self, state):
        if state == Qt.Checked:
            print("选中")
        else:
            print("未选中")

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()