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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 initialise(self):
 """ Initialise this data repository, creating any necessary directories and file paths. """

        self._checkWriteMode()
        self._createSystemTable()
        self._createNetworkTables()
        self._createOntologyTable()
        self._createReferenceSetTable()
        self._createReferenceTable()
        self._createDatasetTable()
        self._createReadGroupSetTable()
        self._createReadGroupTable()
        self._createCallSetTable()
        self._createVariantSetTable()
        self._createVariantAnnotationSetTable()
        self._createFeatureSetTable()
        self._createContinuousSetTable()
        self._createBiosampleTable()
        self._createIndividualTable()
        self._createPhenotypeAssociationSetTable()
        self._createRnaQuantificationSetTable()