def key_for(self, obj):
        """For the given value, return its corresponding key."""
        for key, val in self.items():
            if val is obj:
                return key
        raise ValueError(obj % "The given object could not be found: %r")
dataset/ETHPy150Open clips/pattern/pattern/server/cherrypy/cherrypy/process/win32.py/_ControlCodes.key_for/swapped operands of `%`