def opt_tbformat(self, opt):
        """Specify the format to display tracebacks with. Valid formats are
        'plain', 'emacs', and 'cgitb' which uses the nicely verbose stdlib
        cgitb.text function"""
        try:
            self['tbformat'] = TBFORMAT_MAP[opt]
        except __HOLE__:
            raise usage.UsageError(
                "tbformat must be 'plain', 'emacs', or 'cgitb'.")
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/scripts/trial.py/Options.opt_tbformat