@classmethod
    def _cache_key(cls, *args, **kwargs):
        raise NotImplementedError("Subclass must implement _cache_key")
"Checks WWAN device connection status.
dataset/ETHPy150Open OP2/PyOP2/pyop2/caching.py/ObjectCached._cache_key--crossover with--dataset/ETHPy150Open google/simian/src/simian/mac/client/network_detect.py/IsOnWwan