Fixing the ratio of width and height in the QMainWindow Component(PyQt 6.4)

[ShinyangDevelop]

I was trying to makea window which has a ratio of 16:9, so I tried to use 'setHeightForWidth' and 'heightForWidth', but I failed. So is there anything that I can try? My main window code looks like this...

class MainWindow(QMainWindow):
   def __init__(self):
       super().__init__()
       self.setWindowTitle("iPhone Reinforcement")
       monitor = None
       for m in get_monitors():
           if m.is_primary:
               print(f'Monitor detected: {str(m)}')
               monitor = m
               break

       if monitor != None:
           print(str(m))
           self.resize(QSize(int(monitor.width/2), int(monitor.height/2)))