The provisioning API is still on the older GDataService API. It is being replaced by the new API called directory api (check out here https://developers.google.com/admin-sdk/)
If you just want to at least get start and familiar with the OAuth flow. You should check out this documentation for the Python API client library: https://developers.google.com/api-client-library/python/start/installation
Try the quick start. All you have to do is select the API you want to use, and select the platform (I usually just picked command line). Click 'Configure Project'. Make sure you are already logged in you Google Apps account that you used to create your project in API console. Select your API project and then finally download the whole package.
Remember to replace your client secret file and just run the sample python code. It will do all the OAuth flow for you.