[python] pyqt4,system tray,zavreni aplikace

[vepro]

Pratele,
Zkousim udelat cast kodu, ktera ma mit za cil vytvorit v system tray 
ikonu + menu. V tomto menu budou ruzne polozky (ktere budou dale 
otevirat ruzna okna) a take polozka Exit. Polozka Exit ukonci celou 
aplikaci. Zatim se mi podaril nasledujici kod (viz nize), ktery aplikaci 
ukonci, avsak v konzoli se objevi: Segmentation fault. Je to nekorektni 
postup, ci co to presne znamena?? Nejake navrhy jak to udelat pr  ipadne 
lepe? Dekuji

#!/usr/bin/python
# -*- coding: utf-8 -*-

import sys
from PyQt4 import QtGui, QtCore

class SystemTrayIcon(QtGui.QSystemTrayIcon):
         def __init__(self, icon, parent=None):
                 QtGui.QSystemTrayIcon.__init__(self,parent)
                 self.setIcon(QtGui.QIcon("./pig_icon.gif"))
                 self.trayMenu = QtGui.QMenu()
                 self.exitAction = self.trayMenu.addAction("Exit")
                 self.loadAction = self.trayMenu.addAction("Load")
                 self.setContextMenu(self.trayMenu)
                 self.connect(self.exitAction, 
QtCore.SIGNAL('triggered()'), self.closeApp)
                 self.connect(self.loadAction, 
QtCore.SIGNAL('triggered()'), self.load)
         def closeApp(self):
                 app.exit()
         def load(self):
                 print "load"

if __name__ == '__main__':
         app = QtGui.QApplication(sys.argv)
         trayIcon = SystemTrayIcon(QtGui.QIcon())
         trayIcon.show()
         sys.exit(app.exec_())


Vepro