'Modifies the number of days to retain automated snapshots in
the destination region after they are copied from the source
region.
:type cluster_identifier: string
:param cluster_identifier: The unique identifier of the cluster for
which you want to change the retention period for automated
snapshots that are copied to a destination region.
Constraints: Must be the valid name of an existing cluster that has
cross-region snapshot copy enabled.
:type retention_period: integer
:param retention_period: The number of days to retain automated
snapshots in the destination region after they are copied from the
source region.
If you decrease the retention period for automated snapshots that are
copied to a destination region, Amazon Redshift will delete any
existing automated snapshots that were copied to the destination
region and that fall outside of the new retention period.
Constraints: Must be at least 1 and no more than 35.'

def modify_snapshot_copy_retention_period(self, cluster_identifier, retention_period):

    params = {'ClusterIdentifier': cluster_identifier, 'RetentionPeriod': retention_period}
    return self._make_request(action='ModifySnapshotCopyRetentionPeriod', verb='POST', path='/', params=params)
