Print object information using a namedtuple and a format pattern.

def _prtfmt(self, item_id, dashes):
        """Print object information using a namedtuple and a format pattern."""
        ntprt = self.id2nt[item_id]
        dct = ntprt._asdict()
        self.prt.write('{DASHES:{N}}'.format(
            DASHES=self.fmt_dashes.format(DASHES=dashes, ID=self.nm2prtfmt['ID'].format(**dct)),
            N=self.dash_len))
        self.prt.write("{INFO}\n".format(INFO=self.nm2prtfmt['ITEM'].format(**dct)))