python keystoneclient problem

gistfile1.txt

def verify_token(user_token, admin_token, admin_endpoint, tenant):
    # Verify a user token via private endpoint.
    # Requires the user token to be verified, an admin token and the private admin endpoint.

    print 'Verifying token: ' + user_token

    admin_client = client.Client(token=admin_token, endpoint=admin_endpoint)

    try:
        result = admin_client.tokens.authenticate(token=admin_token, tenant_name=tenant)
        print 'The result is: ' + result if result else 0

    except Unauthorized as u:
        print 'Unauthorized: ' + u.message

    except Exception as e:
        print 'Exception: ' + e.message