Python-集合的常用操作

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Irving
list_1 = [1,4,5,7,3,6,9,7]
list_1 = set(list_1)

list_2 = set([2,6,0,66,22,8,4])
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([1,3,7])
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(999)
print(list_1)

#update
list_1.update([888,777,555])
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(7)