Problem with join in__str__() in class (newbie)

[Fencer]

MRAB wrote:
> Try printing self.topics. It should always be a list of topics.

Ah, yes, that made me find a bug when I was creating the Expert objects: 
the lists of known topics were not created properly. I should have 
posted more code I suppose! Thanks for the help, this problem has now 
been solved. I guess I can't use a join to print the known experts as I 
described in my first post.

- Fencer