def getUnion(self, other):
        if isinstance(other, ObjectSet):
            return self._getUnion(other)

        selSet = self.asSelectionSet()
        selSet.union(other)
        return selSet
:rtype: `SelectionSet`
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/core/nodetypes.py/ObjectSet.getUnion