code: def get_prtfmt(self, key="fmta"):
          
          prtfmt = self.sortobj.grprobj.gosubdag.prt_attr[key]
          prtfmt = prtfmt.replace("{NS}", "{NS} {num_usrgos:>4} uGOs")
          return "".join(['{hdr1usr01:2}', prtfmt, '\n'])
docs: Return print format for Grouper, which includes hdr1usr01 and num_usrgos.