[Tutor] Class attributes

[Timothy M. Brauch]

>
> >>> class BigClass:
> ...   def __str__(self):
> ...     return '[%s, %s]' % (self.a, self.b)

I see, I was leaving out the quotes.  __str__ only works when you return a
string.  It makes sense.  In fact, I think I knew that, but for some reason
it just wasn't sinking in when I coded it.

 - Tim