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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def addPhenotypeAssociationSet(self, phenotypeAssociationSet):
 """ Adds the specified g2p association set to this backend. """

        id_ = phenotypeAssociationSet.getId()
        self._phenotypeAssociationSetIdMap[id_] = phenotypeAssociationSet
        self._phenotypeAssociationSetNameMap[
            phenotypeAssociationSet.getLocalId()] = phenotypeAssociationSet
        self._phenotypeAssociationSetIds.append(id_)