looking for membership management software -- Open Source, written in Python

[Laura Creighton]

I'm looking for an application that handles the membership of an
organisation -- who's a member, who has paid fees, addressbook and 
the odd added field.

Anybody got one they recommend?

Language does not have to be English -- we're going to have to internationalise
whatever we get in any case.  Of course, if it happens to already speak
various European languages, this will be a big plus.

Thanks in advance,
Laura Creighton