Python-集合的常用操作

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3 # Author:Irving
 4 list_1 = [1,4,5,7,3,6,9,7]
 5 list_1 = set(list_1)
 6 
 7 list_2 = set([2,6,0,66,22,8,4])
 8 print(list_1,list_2)
 9 
10 #交集
11 print( list_1.intersection(list_2))
12 
13 #并集
14 print(list_1.union(list_2))
15 
16 #差集 in list_1 but not in list_2
17 print(list_1.difference(list_2))
18 
19 #判断子集
20 list_3 = set([1,3,7])
21 print(list_3.issubset(list_1))
22 print(list_1.issuperset(list_3)) #父集
23 
24 #对称差集(把互相没有的取出来)
25 print(list_1.symmetric_difference(list_2))
26 
27 #add
28 list_1.add(999)
29 print(list_1)
30 
31 #update
32 list_1.update([888,777,555])
33 print(list_1)
34 
35 print(list_1.pop())
36 print(list_1.pop())
37 print(list_1.pop())
38 print(list_1.pop())
39 print(list_1.pop())
40 
41 #discard删除元素不存在不会报错，remove则会
42 list_1.discard(7)