def add(self,
            element):
        self.elements[element] = True
Default action which deletes the selected objects.
dataset/ETHPy150Open Esri/solutions-geoprocessing-toolbox/suitability/toolboxes/scripts/MultidimensionSupplementalTools/MultidimensionSupplementalTools/Scripts/mds/ordered_set.py/OrderedSet.add--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/contrib/admin/actions.py/delete_selected