Returns a new DataFrame with previous index as column(s).

        Returns
        -------
        DataFrame
            DataFrame with the new index a RangeIndex of its length.

def reset_index(self):
        """Returns a new DataFrame with previous index as column(s).

        Returns
        -------
        DataFrame
            DataFrame with the new index a RangeIndex of its length.

        """
        new_columns = OrderedDict()

        new_index = default_index(_obtain_length(self._length, self._data))

        new_columns.update((name, Series(data.values, new_index, data.dtype, name))
                           for name, data in self.index._gather_data().items())

        # the data/columns
        new_columns.update((sr.name, Series(sr.values, new_index, sr.dtype, sr.name))
                           for sr in self._iter())

        return DataFrame(new_columns, new_index)