ptional
            The number of rows to display in a truncated repr (when number
            of rows is above `max_rows`).

        Returns
        -------
        str or None
            String representation of Series if ``buf=None``, otherwise None.

        Examples
        --------
        >>> ser = pd.Series([1, 2, 3]).to_string()
        >>> ser
        '0    1\n1    2\n2    3'
        )	rĄ