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There are various set-like objects in sage. Maybe you should try "set" instead.

sage: S = Set([5,6,44])
sage: S
{44, 5, 6}
sage: S = set([5,6,44])
sage: S
{5, 6, 44}
sage: S = frozenset([5,6,44])
sage: S
frozenset({5, 6, 44})