def get_signal_value(self):
        obj = json.loads(self.request.body.decode('utf-8'))
        if obj not in "signal":
            raise ValueError("invalid signal value")
        return obj['signal']
dataset/ETHPy150Open benoitc/gaffer/gaffer/gafferd/http_handlers/jobs.py/SignalJobHandler.get_signal_value/swapped operands of `not in`