code: def _prt_line_detail(self, prt, line, lnum=""):
          
          data = zip(self.flds, line.split('\t'))
          txt = ["{:2}) {:13} {}".format(i, hdr, val) for i, (hdr, val) in enumerate(data)]
          prt.write("{LNUM}\n{TXT}\n".format(LNUM=lnum, TXT='\n'.join(txt)))
docs: Print each field and its value.