title: apply window title to a GUI in python
body: <p>When definging your own window, you can set the title when explicitly creating it:</p>
  
  <pre><code>class Main(Gtk.Window):
      def __init__(self):
          Gtk.Window.__init__(self, title="GCT")
  </code></pre>
  
  <p>Or if using an editor (I'm using glade), you can set the title at time of GUI design, under General settings > Title.</p>
  
  <p>I'm trying to modify the title of the window in code from a loaded builder file, but the title isn't being applied. Instead it shows up with what is generated in the builder file. </p>
  
  <pre><code>    self.builder = Gtk.Builder()
      self.builder.add_from_file("3x3.glade")
      self.builder.connect_signals(self)      
      self.window = self.builder.get_object("main_window")
      self.window.set_title="This is the new title"
      self.window.show()
  </code></pre>