#!/usr/bin/env python

 import sys

 from PyQt4.QtCore import SIGNAL

 from PyQt4.QtGui import QApplication

 from PyQt4.QtGui import QMainWindow

 from PyQt4.QtGui import QTreeWidget

 from PyQt4.QtGui import QTreeWidgetItem

 class MyTreeItem(QTreeWidgetItem):

     def __init__(self, s, parent=None):

         super(MyTreeItem, self).__init__(parent, [s])

 class MyTree(QTreeWidget):

     def __init__(self, parent=None):

         super(MyTree, self).__init__(parent)

         self.setMinimumWidth(200)

         self.setMinimumHeight(200)

         for s in ['foo', 'bar']:

             MyTreeItem(s, self)

         self.connect(self, SIGNAL('itemClicked(QTreeWidgetItem*, int)'), self.onClick)

     def onClick(self, item, column):

         print(item.text(0))

 class MainWindow(QMainWindow):

     def __init__(self, parent = None):

         super(MainWindow, self).__init__(parent)

         self.tree = MyTree(self)

 def main():

     app = QApplication(sys.argv)

     win = MainWindow()

     win.show()

     app.exec_()

 if __name__ == '__main__':

     main()