python基础（week4_day1）

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3 # author by lh
 4 
 5 a = set([1, 2, 3, 4, 5])
 6 b = set([4, 5, 6, 7, 8])
 7 
 8 # 添加
 9 a.add(6)
10 print(a)
11 
12 # 添加多个
13 a.update([6, 7])
14 print(a)
15 
16 # 删除
17 a.remove(7)
18 print(a)
19 # del a
20 
21 # 差集
22 print(a.difference(b))
23 print(a - b)
24 
25 # 交集
26 print(a.intersection(b))
27 print(a & b)
28 
29 # 并集
30 print(a.union(b))
31 print(a | b)
32 
33 # 父集
34 print(a.issuperset(b))
35 print(a > b)
36 
37 # 子集
38 print(a.issubset(b))
39 print(a < b)