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@@ -1,3 +1,3 @@
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s = {1,2,3}
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s = {12,1,2,3,4}
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s.pop() # 随机弹出一个元素
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print(s)
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@@ -0,0 +1,2 @@
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s = {1,2,3,4}
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s.clear()
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@@ -0,0 +1,8 @@
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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.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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