Bjoern Schliessmann wrote: > class Source(object):
Little bug: The __init__ method of class Source should look like this. def __init__(self, ID, neighbour = None): self.connections = [] self.ID = ID if neighbour: self.connections.append(neighbour) Regards, Björn -- BOFH excuse #102: Power company testing new voltage spike (creation) equipment -- http://mail.python.org/mailman/listinfo/python-list