Python的集合操作总结 

 1 a=set([1,2,3,4,5,6])
 2 b=set([4,5,6,7])
 3 # intersection 交集
 4 #a和b的交集
 5 print(a.intersection(b))#{4, 5, 6}
 6 print(a & b)#{4, 5, 6}
 7  
 8 # union  并集
 9 print(a.union(b))#{1, 2, 3, 4, 5, 6, 7}
10 print(a | b)#{1, 2, 3, 4, 5, 6, 7}  等价于a.union(b)
11  
12 #difference 差集
13 print(a.difference(b))#{1, 2, 3}  in a but not in b
14 print(a - b)#{1, 2, 3}  in a but not in b
15 print(b.difference(a))#{7}
16 print(b - a)#{7}
17 print(a.symmetric_difference(b))#{1, 2, 3, 7}  symmetric 对称差集 除了交集之外的所有
18 print(a ^ b)#{1, 2, 3, 7}  symmetric 对称差集 除了交集之外的所有
19  
20 #父集 超集
21 print(a.issuperset(b))
22 print(a > b)
23 #子集
24 print(a.issubset(b))
25 print(a < b)

 

posted @ 2019-09-25 10:32  测试的世界很精彩  阅读(290)  评论(0)    收藏  举报