Re: [Python-ideas] Implement __add__ for set and frozenset

Perhaps it would be nice to have set.union (and set.intersection) to accept more than one argument, i.e. have

A = S.union(T, U, V)

mean

A = S.union(T) A.update(U) A.update(V)

Something like this has been on my todo list for a while. Patches are welcome. It should be done for union, intersection, difference, and symmetric difference. Some attempt should be made to optimize the ordering so that a&b&c&d will run from the smallest set to the largest (to minimize the total loop count). Raymond