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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def saveProfile(self):
 """ Writes the current profile settings to the persistent store """

        if not self.profile:
            logger.warning("No profile defined (no settings saved)")
            return

        settings = QtCore.QSettings()
        logger.debug("Writing settings to: {}".format(settings.fileName()))

        profGroupName = self.profileGroupName()
        settings.remove(profGroupName) # start with a clean slate

        assert self.mainWindows, "no main windows found"
        for winNr, mainWindow in enumerate(self.mainWindows):
            settings.beginGroup(self.windowGroupName(winNr))
            try:
                mainWindow.saveProfile(settings)
            finally:
                settings.endGroup()