Thank you both for the explanation. As a matter of fact RTFM doesn't -always- help. Sometimes I'm just thick and I can read the manual 10 times and still not understand, as it happened on this particular matter. Your contribution focused my attention on the right bit of the manual which I somehow didn't manage to ingest before. Now I understand.
Thank you. Manu -- http://mail.python.org/mailman/listinfo/python-list
