@classmethod
    def setup_once(cls, fn):
        if cls._setup_once is not None:
            raise ValueError(
                cls._setup_once % "setup_once function already set to %s")
        cls._setup_once = staticmethod(fn)
        return fn
dataset/ETHPy150Open zzzeek/sqlalchemy/examples/performance/__init__.py/Profiler.setup_once/swapped operands of `%`