How to use the mdanalysis.AccumulationMapIndex.resid function in MDAnalysis

elif counter == AccumulationMapIndex.segid:
                    keys1.append(self.segids[idx1])
            else:
                keys1.append("none")
            counter += 1
        counter = 0
        keys2 = []
        for val in map2:
            if val == 1:
                if counter == AccumulationMapIndex.index:
                    keys2.append(idx2)
                elif counter == AccumulationMapIndex.atype:
                    keys2.append(self.type_array[idx2])
                elif counter == AccumulationMapIndex.name:
                    keys2.append(self.name_array[idx2])
                elif counter == AccumulationMapIndex.resid:
                    keys2.append(self.resid_array[idx2])
                elif counter == AccumulationMapIndex.resname:
                    keys2.append(self.resname_array[idx2])
                elif counter == AccumulationMapIndex.segid:
                    keys2.append(self.segids[idx2])
            else:
                keys2.append("none")
            counter += 1
        return [keys1, keys2]