11 lines
214 B
Python
11 lines
214 B
Python
# 集合 set
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set1 = {4,3,2,1}
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set2 = set(li1)
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set3 = set1 & set2 # 交集
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set3 = set1 | set2 # 并集
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set3 = set1 - set2 # 差集
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set3.add(123) # 添加
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set3.remove(123) # 删除
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sum(set3) # 求总个数
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