problem in api V2 ZCRMRestClient in python 3

problem in api V2 ZCRMRestClient in python 3

hi.
i'm getting "NameError: name 'ZCRMRestClient' is not defined" after i did everything the guide askes...

im tring to use SDK for python,
im tring to run :


ZCRMRestClient.initialize()
oauth_client = ZohoOAuth.get_client_instance()
grant_token="grant_token"
oauth_tokens = oauth_client.generate_access_token(grant_token)

that do i do?