On 2007-10-23, TheSeeker <[EMAIL PROTECTED]> wrote: > 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?
Put your data in a class, and implement __hash__ and __eq__ Finally, put your objects in sets. Albert -- http://mail.python.org/mailman/listinfo/python-list