def replace(self, key, value, cas=0, ttl=0, format=None,
                persist_to=0, replicate_to=0):
        return _Base.replace(self, key, value, ttl=ttl, cas=cas, format=format,
                             persist_to=persist_to, replicate_to=replicate_to)
Store an object in Couchbase only if it already exists.
dataset/ETHPy150Open couchbase/couchbase-python-client/couchbase/bucket.py/Bucket.replace