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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 indexables(self):
 """ create the indexables from the table description """

        if self._indexables is None:

            d = self.description

            # the index columns is just a simple index
            self._indexables = [GenericIndexCol(name='index', axis=0)]

            for i, n in enumerate(d._v_names):

                dc = GenericDataIndexableCol(
                    name=n, pos=i, values=[n], version=self.version)
                self._indexables.append(dc)

        return self._indexables