Using an mdiArea in PyQt

I am adding a notifications area to openmolar, and experimenting with an mdiArea for this.
I couldn't find a nice python (PyQt) example on the web, so offer this for google's sake.

import sys
from PyQt4 import QtCore, QtGui

app = QtGui.QApplication(sys.argv)

mdiArea = QtGui.QMdiArea()
mdiArea.show()

labels = []

for i in range(5):
    labels.append(QtGui.QLabel())
    labels[i].setText("hello world")
    mdiArea.addSubWindow(labels[i])
    labels[i].show()
    
mdiArea.cascadeSubWindows()

sys.exit(app.exec_())