def _update (self, dict, mode):
        if mode == "careful":
            self._update_careful(dict)
        elif mode == "loose":
            self._update_loose(dict)
        else:
            raise ValueError, mode % "invalid update mode: %r"
dataset/ETHPy150Open skyostil/tracy/src/generator/Cheetah/Utils/optik/option_parser.py/Values._update/swapped operands of `%`