The discussion's gone a bit off topic so I don't know if it is a good idea to continue here. I'll try.
My first question was about a way to order a python set. Someone suggested to try this module: http://code.activestate.com/recipes/528878/ It seemed pretty good, but I've tried it just today and something doesn't work. I think it doesn't work because what I have to order are objects and not just numbers. Anyway, I'm not sure that this is the problem. What I get when I try to append one of my object is: File "notes.py", line 245, in __init__ self.append(root) File "ordered_set.py", line 78, in append self._insertatnode(self._end.prev, element) File "ordered_set.py", line 110, in _insertatnode if element in self._map: TypeError: unhashable instance Don't know if it is important, but inside the class of the object that I'm trying to append, I redefined the __eq__ and __gt__ method. -- http://mail.python.org/mailman/listinfo/python-list