def prepend(self, key, value, cas=0, format=None,
                persist_to=0, replicate_to=0):
        """Prepend a string to an existing value in Couchbase.

        .. seealso:: :meth:`append`, :meth:`prepend_multi`
        """
        return _Base.prepend(self, key, value, cas=cas, format=format,
                             persist_to=persist_to, replicate_to=replicate_to)
Prepend a string to an existing value in Couchbase.

        .. seealso:: :meth:`append`, :meth:`prepend_multi`