> I'm trying to understand how does save state works using QT... > ... I only found C++ examples which I cant read,
Being able to mentally translate the C++ code in the Qt doc into Python is a very useful skill! It really isn't too hard. Turn :: into dot and add "self." everywhere. The first thing to know is how to get control when the app is quitting and what to do then. There is an example here: http://qt-project.org/doc/qt-5.0/qtwidgets/qmainwindow.html#saveState What this is trying to say is: your main window subclass (what you called MyWindow in your sample code) needs to define its own method closeEvent(). What does this method do? You look up to the top of the QMainWindow page and there is no definition for closeEvent. This tells you it is inherited. So you click the link at the top, "List of all members, including inherited members" and see closeEvent in the list, click it, and you are now on the QWidget page. So this is where QMainWindow inherits closeEvent from. On that page you get the details of what closeEvent does and when it is called. Read it. Now go back to the QMainWindow::saveState link above. So when your main window is being closed, Qt will call its closeEvent method. If you do not define one, nothing is saved at close time. So add some code to your class like: def closeEvent(self, event): ...something… In that method you can use a QSettings object to save the window size and position ("Geometry"). Maybe back in the __init__ you did this: self.settings = QSettings("MyCompany","MyAppname") Read about the QSettings object here: http://qt-project.org/doc/qt-5.0/qtcore/qsettings.html Now in the closeEvent you can do this (not tested!) self.settings.setValue("geometry", self.saveGeometry()) self.settings.setValue("statebytes", self.saveState()) Then, up in your __init__ method, you can use the settings object to recover the geometry and the state bytearray from the last time the program ended. See this link: http://qt-project.org/doc/qt-5.0/qtwidgets/qmainwindow.html#restoreState for a very similar example. In short: * During shutdown your closeEvent() is called * in it, you save everything in QSettings * During __init__ you get everything back by querying the settings object.
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