Cannot assign instance to a given network from Python novaclient API

i think the common way to solve such problem is:

1. find documents in docs.openstack.org
    for i.e. http://docs.openstack.org/api/openstack-compute/2/content/NetworksSection.html , it may not be right, but can provide a general knowlege, like it said:"The parameter fixed_ip is used only when network uuid is specified; also, when port is specified, network uuid and fixed_ip are properties of the port and are ignored. Omit fixed_ip and (network) uuid to avoid validation errors."
2. use cli help,
    for this case: nova help create, it can give you a direct param help message
3. read the source code, code is power
    for i.e. in novaclient/base.py:

384 if nics is not None:
385 # NOTE(tr3buchet): nics can be an empty list
386 all_net_data = []
387 for nic_info in nics:
388 net_data = {}
389 # if value is empty string, do not send value in body
390 if nic_info.get('net-id'):
391 net_data['uuid'] = nic_info['net-id']
392 if nic_info.get('v4-fixed-ip'):
393 net_data['fixed_ip'] = nic_info['v4-fixed-ip']
394 if nic_info.get('port-id'):
395 net_data['port'] = nic_info['port-id']
396 all_net_data.append(net_data)
397 body['server']['networks'] = all_net_data

so, nics is a list of dict, each may have key of net-id, v4-fixed-ip, port-id, in your case, you can use nova.servers.create(name="samplehost", image=image, flavor=flavor,nics=[{'net-id': '9883ec93-4589-4fa2-825d-7a9a8215fd07'}])

it may not be right, because it depends on which version of novaclient you have installed. you can check and fix it

good luck