title: Close the main window and open a new one - PyQt
body: <p>In PyQt, is it any way to close the main window and open a new one? </p>
  
  <p>In particular, I am trying to close a window and open the same window all over again. I've tried every way I could think of without success (with some resulting in segmentation fault). I need to do this because the new window will have some features according to the parameters that are passed.</p>