Python-集合的常用操作

 #!/usr/bin/env python
 # -*- coding:utf- -*-
 # Author:Irving
 list_1 = [,,,,,,,]
 list_1 = set(list_1)

 list_2 = set([,,,,,,])
 print(list_1,list_2)

 #交集
 print( list_1.intersection(list_2))

 #并集
 print(list_1.union(list_2))

 #差集 in list_1 but not in list_2
 print(list_1.difference(list_2))

 #判断子集
 list_3 = set([,,])
 print(list_3.issubset(list_1))
 print(list_1.issuperset(list_3)) #父集

 #对称差集(把互相没有的取出来)
 print(list_1.symmetric_difference(list_2))

 #add
 list_1.add()
 print(list_1)

 #update
 list_1.update([,,])
 print(list_1)

 print(list_1.pop())
 print(list_1.pop())
 print(list_1.pop())
 print(list_1.pop())
 print(list_1.pop())

 #discard删除元素不存在不会报错，remove则会
 list_1.discard()