Save QSettings when OK button is pressed

[ecce]

I'm in the process of creating a Settings dialog for my PyQt5 application. I have a button in the MainWindow toolbar that pops up a dialog box, containing a checkbox and a buttonBox (ui file). The idea is to load QSettings and show the appropriate settings (checked/unchecked). Changes can be made, and those are to be saved when you click the OK button.

So how do you do this? I thought that one way would be to "intercept" the OK clicking event and insert a few lines of code before the dialog is closed. I tried this:

class SettingsDialog(QDialog, Ui_SettingsDialog):
    def __init__(self, parent=None):
        super(SettingsDialog, self).__init__(parent)
        self.setupUi(self)
        self.settings = QSettings(QSettings.IniFormat, QSettings.SystemScope, 'someBiz', '__settings')
        self.settings.setFallbacksEnabled(False)
 
        self.buttonBox.accepted.connect(self.accept)
        self.buttonBox.rejected.connect(self.reject)
 
        self.addSettingCategories()
 
 
    def addSettingCategories(self):
        q = QTreeWidgetItem(self.settingsTree, ['General Settings'])
        q.setIcon(0, QIcon('icons/32x32/gear_in.png'))
 
 
    def accept(self):
        # Insert QSettings save code here
        print('accepted!')
        super(SettingsDialog, self).accept()

class SettingsDialog(QDialog, Ui_SettingsDialog):
    def __init__(self, parent=None):
        super(SettingsDialog, self).__init__(parent)
        self.setupUi(self)
        self.settings = QSettings(QSettings.IniFormat, QSettings.SystemScope, 'someBiz', '__settings')
        self.settings.setFallbacksEnabled(False)

        self.buttonBox.accepted.connect(self.accept)
        self.buttonBox.rejected.connect(self.reject)

        self.addSettingCategories()


    def addSettingCategories(self):
        q = QTreeWidgetItem(self.settingsTree, ['General Settings'])
        q.setIcon(0, QIcon('icons/32x32/gear_in.png'))


    def accept(self):
        # Insert QSettings save code here
        print('accepted!')
        super(SettingsDialog, self).accept()

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That works, it prints out "accepted!" two times (button pressed and released?). My question is a bit general: Is this a suitable approach, or how do you usually do this? I guess another options is to return the QSettings object to the MainWindow and save it to file there?