def expunge(self, instance=None):
        return self.session.expunge(instance)
Returns True iff the string s is in this shard.
dataset/ETHPy150Open lsbardel/python-stdnet/stdnet/odm/session.py/Transaction.expunge--crossover with--dataset/ETHPy150Open pantsbuild/pants/src/python/pants/base/hash_utils.py/Sharder.is_in_shard