from keystoneauth1.identity import v2
from keystoneauth1 import session
from keystoneclient.v2_0 import client

username = ''
password = ''
tenant_name = ''
tenant_id = ''
auth_url = ''

auth = v2.Password(username=username, password=password, tenant_id=tenant_id,
                   tenant_name=tenant_name, auth_url=auth_url)
sess = session.Session(auth=auth)
keystone = client.Client(version=2, session=sess, debug=True)


print keystone.tenants.list()