Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from keystoneclient.auth.identity import v3
>>> from keystoneclient import session
>>> from keystoneclient.v3 import client
>>> from constants import constants as con
>>> auth = v3.Password(
...             auth_url=con.auth_url,
...             username=con.username,
...             password=con.password,
...             project_name=con.project_name,
...             project_domain_name=con.project_domain_name,
...             user_domain_name=con.user_domain_name)
>>>
>>> session = session.Session(auth=auth)
>>> key_cli = client.Client(session=session)
>>>
>>> from novaclient import client
>>> from novaclient import api_versions
>>> nova = client.Client("2.1", session=session)
>>> latest = api_versions.discover_version(api_versions.APIVersion("2.latest"), nova)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/novaclient/api_versions.py", line 267, in discover_version
    client)
  File "/usr/local/lib/python2.7/dist-packages/novaclient/api_versions.py", line 248, in _get_server_version_range
    version = client.versions.get_current()
AttributeError: 'APIVersion' object has no attribute 'versions'