Problems using psycopg2 listen features

Hi

I am trying to use the notify/listen features of postgres and psycopg2, however when using example code from the documents and running notify.py script in:
/psycopg2-2.4.5/examples$ python notify.py

I get the following error when send a notification from postgres:

Traceback (most recent call last):
File "notify.py", line 45, in <module>
conn.poll()
AttributeError: 'psycopg2._psycopg.connection' object has no attribute 'poll'

Not sure why I am getting this error as it is example code?

I am running:

Python: 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
Ubuntu:
Distributor ID: Ubuntu
Description: Ubuntu 10.04.3 LTS
Release: 10.04
Codename: lucid

And the latest psycopg2

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