>>> targets = [
...     {"id": 0, "X": set(), "Y": (), "Z": ()},
...     {"id": 1, "X": set((1,)), "Y": set((5,)), "Z": set()},
...     {"id": 2, "X": set((1,)), "Y": set((5, 7)), "Z": set()},
...     {"id": 3, "X": set((2,)), "Y": set((5, 7)), "Z": set((1,))},
...     {"id": 4, "X": set((1, 2)), "Y": set((5, 7)), "Z": set((1,))},
...     {"id": 5, "X": set((1, 2)), "Y": set((5, 7)), "Z": set((1, 3))},
... ]
>>> key = {"X": set((1,)), "Y": set((7, 5)), "Z": set(())}
>>> find(targets, key)