title: Python script using Glade code produces glib error about old version of GTK
body: <p>I am trying to create my first Glade GUI using Python as the back-end. I created the GUI in Glade and saved the file as a .glade. I then created my Python code and saved it in the same directory as the glade file. Upon running the Python file in the terminal, I receive the following message:</p>
  
  <pre><code>    Traceback (most recent call last):
        File "glade6.py", line 56, in &lt;module&gt;
          main = Buglump()
        File "glade6.py", line 20, in __init__
          self.builder.add_from_file("glade6.glade")
      glib.GError: glade6.glade: required gtk+ version 3.10, current version is 2.24
  </code></pre>
  
  <p>OS:
  Ubuntu 14.04.1 LTS 64-bit </p>
  
  <p>And the Python file that was run:
  Code acquired from '<a href="http://gnipsel.com/glade/index.html" rel="nofollow">http://gnipsel.com/glade/index.html</a>'</p>
  
  <pre><code>    #!/usr/bin/env python
      import sys
  
      try: 
        import gtk
        import gtk.glade
      except:
        print('GTK not available')
        sys.exit(1)
      try:
        import pygtk
        pygtk.require('2.0')
      except:
        pass
  
      class Buglump:
  
        def __init__(self):
          self.builder = gtk.Builder()
          self.builder.add_from_file("glade6.glade")
          self.builder.connect_signals(self)
  
          # the liststore
          self.liststore = gtk.ListStore(int,str)
          self.liststore.append([0,"Select an Item:"])
          self.liststore.append([1,"Row 1"])
          self.liststore.append([2,"Row 2"])
          self.liststore.append([3,"Row 3"])
          self.liststore.append([4,"Row 4"])
          self.liststore.append([5,"Row 5"])
  
          # the combobox
          self.combobox = self.builder.get_object("combobox1")
          self.combobox.set_model(self.liststore)
          self.cell = gtk.CellRendererText()
          self.combobox.pack_start(self.cell, True)
          self.combobox.add_attribute(self.cell, 'text', 1)
          self.combobox.set_active(0)
  
          self.window = self.builder.get_object("window1")
          self.window1.show()
  
        def on_combobox1_changed(self, widget, data=None):
          self.index = widget.get_active()
          self.model = widget.get_model()
          self.item = self.model[self.index][1]
          print "ComboBox Active Text is", self.item
          print "ComboBox Active Index is", self.index
          self.builder.get_object("label1").set_text(self.item)
  
        def on_window1_destroy(self, object, data=None):
          print "quit with cancel"
          gtk.main_quit()
  
      if __name__ == "__main__":
        main = Buglump()
        gtk.main()
  </code></pre>