Comment 1 for bug 174396

Try importing avg instead of libavg:

$ python
Python 2.5.1 (r251:54863, Oct 5 2007, 13:50:07)
[GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import avg
>>> avg
<module 'avg' from '/usr/lib/python2.5/site-packages/libavg/avg.so'>
>>>