title: how to put widgets inside a PyQt QMdiSubWindow
body: <p>Sorry, my question may sound very stupid but Frankly i spend a lot of time on internet trying to figure out how to add a widget<strong>s</strong> to QMdiSubWindow, I mean a <strong>Multiple Widgets</strong> not just one Widget(this is very important for me .. I need my Sub window to contain a multiple widget not a single widget).</p>
  
  <p>for example i want to add this widgets and layouts to My Sub Window:</p>
  
  <p>QVbox which contains a QlineEdit and Push Button, And QHbox which contain a a Push Button ... </p>
  
  <blockquote>
    <p>it doesn't matter if you show me how i could do it using the above example, what really matter is to show me how no matter what example you use </p>
  </blockquote>
  
  <p><strong>Note</strong> : Please Use OOP and Python not c++</p>