Hi, I have run into something I would like to do, but am not sure how to code it up. I would like to perform 'set-like' operations (union, intersection, etc) on a set of objects, but have the set operations based on an attribute of the object, rather than the whole object.
For instance, say I have (pseudo-code): LoTuples1 = [(1,1,0),(1,2,1),(1,3,3)] Set1=set(LoTuples1) LoTuples2 = [(2,1,3),(2,2,4),(2,3,2)] Set2=set(LoTuples2) What I would like to be able to do is: Set3 = Set1union(Set2) Set3.intersection(Set2, <use object[2]>) to return: set([(2,1,3), (1,3,3)]) How can one do this operation? Thanks, Duane -- http://mail.python.org/mailman/listinfo/python-list
