# import our modules
import sys, time
from PySide.QtGui import QApplication,QMainWindow

# our MainWindow!!
class MainWindow(QMainWindow):
"""puffing!! construst our MainWindow"""

def __init__(self, arg):
super(MainWindow, self).__init__()
self.arg = arg
self.initGUI() # belong to MainWindow

# def GUI
def initGUI(self):
self.setWindowTitle("MainWindow")
self.setGeometry(300,300,300,300)
self.show()

if __name__ == '__main__':
# exception handling
try:
myApp = QApplication(sys.argv)
mywindow = MainWindow(0)
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])