code: def to_string(self, buf=None, na_rep='NaN', float_format=None, header=True,
                    index=True, length=False, dtype=False, name=False,
                    max_rows=None):
          
  
          formatter = fmt.SeriesFormatter(self, name=name, length=length,
                                          header=header, index=index,
                                          dtype=dtype, na_rep=na_rep,
                                          float_format=float_format,
                                          max_rows=max_rows)
          result = formatter.to_string()
  
          # catch contract violations
          if not isinstance(result, str):
              raise AssertionError("result must be of type unicode, type"
                                   " of result is {0!r}"
                                   "".format(result.__class__.__name__))
  
          if buf is None:
              return result
          else:
              try:
                  buf.write(result)
              except AttributeError:
                  with open(buf, 'w') as f:
                      f.write(result)
docs: Render a string representation of the Series.
  
          Parameters
          ----------
          buf : StringIO-like, optional
              Buffer to write to.
          na_rep : str, optional
              String representation of NaN to use, default 'NaN'.
          float_format : one-parameter function, optional
              Formatter function to apply to columns' elements if they are
              floats, default None.
          header : bool, default True
              Add the Series header (index name).
          index : bool, optional
              Add index (row) labels, default True.
          length : bool, default False
              Add the Series length.
          dtype : bool, default False
              Add the Series dtype.
          name : bool, default False
              Add the Series name if not None.
          max_rows : int, optional
              Maximum number of rows to show before truncating. If None, show
              all.
  
          Returns
          -------
          str or None
              String representation of Series if ``buf=None``, otherwise None.