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from collections import Counter
a = [{(1,2), (3,4)}, {(1, 2), (3, 4)}, {(1, 2)}]
print([set(k) for k, v in Counter(map(lambda x: tuple(sorted(x)), a)).items() if v == 1])
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py3
a = frozenset({1, 2, 3})
b = frozenset({4, 5, 6})
c = frozenset({"7", "8", "9"})
d = {a, b, c}
print(d)
{frozenset({1, 2, 3}), frozenset({4, 5, 6}), frozenset({'9', '8', '7'})}
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