def preparingUpdate(self, troveNum, troveCount):
        pass
Add a value to the cache, failing if the key already exists.
dataset/ETHPy150Open sassoftware/conary/conary/callbacks.py/UpdateCallback.preparingUpdate--crossover with--dataset/ETHPy150Open sebleier/django-redis-cache/redis_cache/backends/base.py/BaseRedisCache.add