Python sdk error import can't find client, etc.

The cli_client.py script (downloaded in the examples with the SDK download from the Dropbox site) does not work.  I get the error:

from dropbox import client, rest, session
ImportError: cannot import name client

I have tried installing the SDK both with PIP and by running the setup. I have tried uninstalling it and re-installing it.  

Has the SDK changed so that the code in the example no longer works?  Where is the current documentation? Or the current SDK that matches the documentation?

Thanks for any help...