[PyQt] Question about QListView

[Ralph Kube]

Hey people,
I have a simple question about using QListView in my application.
Lets say, I want QListView to display a number of strings.
On the command line the following works:

str_list = ['str1', 'str2', ... , 'strn']
qstr = QStringList(str_list)
qstr_model = QStringListModel(qstr)
lv = QListView()
lv.setModel(qstr_model)
lv.show()

I get a ListView with the strings in there. Great.
Now I got the following code in my app and it doesn't show anything:


class ListViewTest(QtGui.QMainWindow):
	def __init__(self, *args):
		apply(QtGui.QMainWindow.__init__, (self, ) + args)

		self.setGeometry(300, 300, 300, 50)
		self.setWindowTitle('ListViewTest')

		qstr = QtCore.QStringList(QtCore.QString('foo'))
		qstr_model = QtGui.QStringListModel(qstr)
		self.lv = QtGui.QListView(self)
		self.lv.move(120,10)		
		self.lv.setModel(qstr_model)

		self.pb = QtGui.QPushButton('Update', self)
		self.pb.move(10,10)
		
		QtCore.QObject.connect(self.pb, QtCore.SIGNAL('clicked()'), 
self.update_list)
		
		
	def update_list(self):
	
		qstr = QtCore.QStringList(QtCore.QString('bar'))
		qstr_model = QtGui.QStringListModel(qstr)
		self.lv.setModel(qstr_model)
		print 'Button pressed'


app = QtGui.QApplication(sys.argv)
mywin = ListViewTest()
mywin.show()
app.exec_()


Any ideas about that? I surely am confused.
Cheers, Ralph