docs: def simple_separated_format(separator):
      """Construct a simple TableFormat with columns separated by a separator.
  
      >>> tsv = simple_separated_format("\\t") ; \
          tabulate([["foo", 1], ["spam", 23]], tablefmt=tsv) == 'foo \\t 1\\nspam\\t23'
      True
  
      """
      return TableFormat(None, None, None, None,
                         headerrow=DataRow('', separator, ''),
                         datarow=DataRow('', separator, ''),
                         padding=0, with_header_hide=None)