python script which subscribes/listens to Azure Event Hub?

I am interested in listening to an Event Hub from a Python script and executing some code when an inbound message is detected.

On Ubuntu, using Python 2.7 with https://pypi.python.org/pypi/python-qpid-proton/0.10 and the example "receiver" script, I attempt to subscribe to a URI that looks like:

    amqps://<key name>:<key>@<namespace>.servicebus.windows.net/<event hub name>/ConsumerGroups/$Default/Partitions/0

The following error is returned:

    proton.MessengerException: Cannot subscribe to <...>

I believe that my Event Hub is set up correctly because I am able to send events into it using a separate "send" script and the Azure dashboard shows that events have arrived.  But I am unable to connect as a subscriber to receive messages.

Any thoughts/suggestions?

TIA
Jaman