code: def head_item(self):
          
          delimiter = self.style.attr_minor(self.style.delimiter)
          hint = self.style.header_hint * self.wide
          heading = (u'{delimiter}{hint}{delimiter}'
                     .format(delimiter=delimiter, hint=hint))
          alignment = lambda *args: (
              self.term.rjust(*args) if self.style.alignment == 'right' else
              self.term.ljust(*args))
          txt = alignment(heading, self.hint_width, self.style.header_fill)
          return self.style.attr_major(txt)
docs: Text of a single column heading.