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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 runGetExpressionLevel(self, id_):
 """ Runs a getExpressionLevel request for the specified ID. """

        compoundId = datamodel.ExpressionLevelCompoundId.parse(id_)
        dataset = self.getDataRepository().getDataset(compoundId.dataset_id)
        rnaQuantificationSet = dataset.getRnaQuantificationSet(
            compoundId.rna_quantification_set_id)
        rnaQuantification = rnaQuantificationSet.getRnaQuantification(
            compoundId.rna_quantification_id)
        expressionLevel = rnaQuantification.getExpressionLevel(compoundId)
        return self.runGetRequest(expressionLevel)