[PySide] Why doesn't this example work?

[Jim Byrnes]

In looking at the lists archives, I see that most of the participants 
seem to be experienced developers.  As a novice programmer I hope I am 
not intruding by asking some basic questions.

I am working my way through examples in a PySide book I bought. 
According to the author the example should display a 200 x 150 window, 
pause 3 seconds and then display a 300 x 300 window.  On my system 
(Ubuntu 12.04) there is a approx 3 second delay after starting the 
program and then I see the 300 x 300 window. I never see the first window.

Could someone explain to me why it does not act as described?

# Import required modules
import sys
import time
from PySide.QtGui import QApplication, QWidget

class SampleWindow(QWidget):
     """ Our main window class
     """

     # Constructor function
     def __init__(self):
         QWidget.__init__(self)
         self.setWindowTitle("Sample Window")
         self.setGeometry(300, 300, 200, 150)
         self.setMinimumHeight(100)
         self.setMinimumWidth(250)
         self.setMaximumHeight(200)
         self.setMaximumWidth(800)

if __name__ == '__main__':
     # Exception Handling
     try:
         myApp = QApplication(sys.argv)
         myWindow = SampleWindow()
         myWindow.show()
         time.sleep(3)
         myWindow.resize(300, 300)
         myWindow.setWindowTitle("Sample Window Resized")
         myWindow.repaint()
         myApp.exec_()
         sys.exit(0)
     except NameError:
         print("Name Error:", sys.exc_info()[1])
     except SystemExit:
         print("Closing Window...")
     except Exception:
         print (sys.exc_info()[1])

Thanks,  Jim