'The secondary members known to this client.
A sequence of (host, port) pairs. Empty if this client is not
connected to a replica set, there are no visible secondaries, or this
client was created without the `replicaSet` option.
.. versionadded:: 3.0
MongoClient gained this property in version 3.0 when
MongoReplicaSetClient\'s functionality was merged in.'

@property
def secondaries(self):

    return self._topology.get_secondaries()
