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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 runGetReadGroup(self, id_):
 """ Returns a read group with the given id_ """

        compoundId = datamodel.ReadGroupCompoundId.parse(id_)
        dataset = self.getDataRepository().getDataset(compoundId.dataset_id)
        readGroupSet = dataset.getReadGroupSet(compoundId.read_group_set_id)
        readGroup = readGroupSet.getReadGroup(id_)
        return self.runGetRequest(readGroup)