def difference_update(self, *others):
        self.db.sdiffstore(self.key, [o.key for o in [self.key] + others])
Returns a list of (start time, service time) tuples for complete __tasks.
dataset/ETHPy150Open iamteem/redisco/redisco/containers.py/Set.difference_update--crossover with--dataset/ETHPy150Open radlab/sparrow/src/main/python/parse_logs.py/Request.start_and_service_times