code: def setup_columns(self):
          
          for name in self.view:
              w = self.view[name]
              if isinstance(w, Gtk.TreeView):
                  m = w.get_model()
                  for c in w.get_columns():
                      self.setup_column(c, model=m)
docs: Search the view for :class:`TreeView` instances and call
          :meth:`setup_column` on all their columns.
  
          .. note::
             This is a convenience function. It is never called by the framework.
             You are free to repurpose it in subclasses.
  
          For editing to work, the widget must already be connected to a model.
          If you don't use :class:`ListStoreModel` this can be done in Glade,
          however a `bug <https://bugzilla.gnome.org/show_bug.cgi?id=597095>`_
          makes versions prior to 3.7.0 (released March 10th, 2010) remove
          Python columns on save. If you want to correct the XML manually, it
          should look like this::
  
           <object class="GtkListStore" id="liststore1">
             <columns>
               <column type="PyObject"/>
             </columns>
           </object>