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@@ -1,6 +1,6 @@
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A = {1, 2, 3}
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B = {3, 4, 5}
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print(B.union(B)) # 并集
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print(A.union(B)) # 并集
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print(A.intersection(B)) # 交集
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print(A.difference(B)) # 在 A 不在 B
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print(A.symmetric_difference(B)) # 在 A 或 B 但不同时在两者中
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