attach nodes to pool using F5 SDK

Using F5 SDK:

nodes = _create_nodes() mgmt.tm.ltm.nodes.node.create(**nodes_params) pool = _create_pool() mgmt.tm.ltm.pools.pool.create(**ps_params)

how can i attach the nodes to the pool? Using pool.members_s.member.create(**kyargs) throws exception when create two vs with same node fqdns