How to specify auto or none for the --nic option when creating an instance

Issue

When creating an instance, an error will occur if the --nic option is specified as auto or none.

openstack server create test-vm --flavor m1.nano --image cirros --nic auto --wait

Error Message

nics must be a list or a tuple, not <type 'unicode'>

• To start an instance using --nic auto to automatically assign an IP address.
• To start an instance that does not connect to any network using --nic none.