Using Avogadro from Python

avogadrostandalone.py

# Developed by Tim Vandermeersch, with a blog post at
# http://timvdm.blogspot.com/2009/05/using-avogadro-library-from-python.html
#
#import openbabel
# needed for OB formats on linux (can be omitted by importing openbabel first)
import sys
if sys.platform.find('linux') != -1:
  try:
    import dl
  except ImportError:
    import DLFCN as dl
  sys.setdlopenflags(sys.getdlopenflags() | dl.RTLD_GLOBAL)

from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4 import uic
import Avogadro
import sys

class MainWindow(QMainWindow):
  def __init__(self):
    QMainWindow.__init__(self)

    uiFile = file('mainwindow.ui', 'r')
    self.ui = uic.loadUi(uiFile, self)
    
    self.connect(self.ui.actionOpen, SIGNAL('triggered()'), self, SLOT('open()'))
    self.connect(self.ui.listWidget, SIGNAL('currentRowChanged(int)'), self, SLOT('load(int)'))

    self.objects = []

  def newGLWidget(self):
    glWidget = Avogadro.GLWidget()
    glWidget.loadDefaultEngines()
    glWidget.quality = 4
    toolGroup = Avogadro.ToolGroup()
    tool = Avogadro.PluginManager.instance.tool('Navigate', None)
    if tool:
      toolGroup.append(tool)
      self.objects.append(tool)
    glWidget.toolGroup = toolGroup
    self.objects.append(glWidget)
    self.objects.append(toolGroup)
    return glWidget

  @pyqtSignature('load(int)')
  def load(self, row):
    mol = self.molFile.molecule(row)
    self.objects.append(mol)
    glWidget = self.newGLWidget()
    glWidget.molecule = mol
    mdiWindow = self.ui.mdiArea.addSubWindow(Avogadro.toPyQt(glWidget))
    print glWidget
    print Avogadro.toPyQt(glWidget)
    mdiWindow.setWindowTitle(self.molFile.titles[row])
    mdiWindow.show()

  @pyqtSignature('readThreadFinnished()')
  def readThreadFinnished(self):
    self.ui.listWidget.clear()
    self.ui.listWidget.addItems(self.molFile.titles)
    self.ui.statusbar.showMessage('Done.', 5)

  @pyqtSignature('open()')
  def open(self):
    filename = str(QFileDialog.getOpenFileName(self, 'Open', QDir.currentPath(), 
          'Chemistry files (*.cml *.sdf *.mol *.xyz)'))
    self.molFile = Avogadro.MoleculeFile.readFile(filename, '', '', False)
    self.connect(Avogadro.toPyQt(self.molFile), SIGNAL('ready()'), self, SLOT('readThreadFinnished()'))
    self.ui.statusbar.showMessage('Reading file...')

if __name__ == "__main__":
  app = QApplication(sys.argv)

  window = MainWindow()
  window.show()

  sys.exit(app.exec_())

mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>681</width>
    <height>494</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QHBoxLayout" name="horizontalLayout">
    <item>
     <widget class="QListWidget" name="listWidget">
      <property name="minimumSize">
       <size>
        <width>150</width>
        <height>0</height>
       </size>
      </property>
     </widget>
    </item>
    <item>
     <widget class="QMdiArea" name="mdiArea"/>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>681</width>
     <height>28</height>
    </rect>
   </property>
   <widget class="QMenu" name="menu_File">
    <property name="title">
     <string>&amp;File</string>
    </property>
    <addaction name="actionOpen"/>
   </widget>
   <addaction name="menu_File"/>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
  <action name="actionNew">
   <property name="text">
    <string>New</string>
   </property>
  </action>
  <action name="actionOpen">
   <property name="text">
    <string>Open</string>
   </property>
  </action>
 </widget>
 <resources/>
 <connections/>

It seems to me like there is a </ui> missing at the end of mainwindow.ui.

Hello
I tried to use this code with version 1.2 of Avogadro and the molecules are not displayed. Is it possible to correct this error ????
Best Regards