code: def register(self, widget, basename, **parameters):
          
          self.registry.append((widget, basename, parameters))
docs: Register a widget, URL basename and any optional URL parameters.
  
          Parameters are passed as keyword arguments, i.e.
              >>> router.register(MyWidget, 'mywidget', my_parameter="[A-Z0-9]+")
  
          This would be the equivalent of manually adding the following
          to urlpatterns:
              >>> url(r"^widgets/mywidget/(P<my_parameter>[A-Z0-9]+)/?",
                                           MyWidget.as_view(), "widget_mywidget")