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import sys

from PySide6.QtWidgets import QMainWindow, QCheckBox, QPushButton, QApplication


class MyWindow(QMainWindow):

    def __init__(self):
        QMainWindow.__init__(self)
        self.setWindowTitle('QT check box with Python')
        self.resize(320, 150)

        self.__checkBox = QCheckBox("Selected or not selected ?", self)
        self.__checkBox.setGeometry(10, 10, 230, 35)

        self.__toggleButton = QPushButton("Change checkbox state", self)
        self.__toggleButton.setGeometry(10, 50, 230, 35)

        self.__toggleButton.clicked.connect(self.toggle)

    def toggle(self):
        self.__checkBox.toggle()


if __name__ == "__main__":
    app = QApplication(sys.argv)

    myWindow = MyWindow()
    myWindow.show()

    sys.exit(app.exec())