Qt Button click and statusbar

#!/usr/bin/python

import sys
from PyQt4 import QtGui, QtCore

class Example(QtGui.QMainWindow):

    def __init__ (self, parent=None):
        super(Example, self).__init__()
        self.initUI()

    def initUI(self):

        button1 = QtGui.QPushButton("Button 1", self)
        button1.move(30, 50)

        button2 = QtGui.QPushButton("Button 2", self)
        button2.move(150, 50)

        self.connect(button1, QtCore.SIGNAL('clicked()'), self.buttonClicked)
        self.connect(button2, QtCore.SIGNAL('clicked()'), self.buttonClicked)

        self.statusBar()
        self.setGeometry(300, 300, 350, 250)
        self.setWindowTitle('Example: Signal - Slot')
        self.show()

    def buttonClicked(self):
        sender = self.sender()
        self.statusBar().showMessage(sender.text() + ' was pressed');


def main():
    app = QtGui.QApplication(sys.argv)
    qs = Example()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()