去重 无序 没有索引
#remove 删除元素
>>> s1 = {1,2,3,4,5}
>>> s1.remove(2)
>>> print(s1)
{1, 3, 4, 5}
#pop 剪切
>>> s1 = {1,2,3,4,5}
>>> res = s1.pop()
>>> print(res)
1
#add 添加
>>> s1 = {1,2,3,4,5}
>>> s1.add(‘250‘)
>>> print(s1)
{1, 2, 3, 4, 5, ‘250‘}
#update 添加新的元素
>>> s1 = {1,2,3,4,5}
>>> s1.update(‘1‘,‘2‘,‘8‘,‘9‘)
>>> print(s1)
{1, 2, 3, 4, 5, ‘9‘, ‘1‘, ‘2‘, ‘8‘}
#判断一个集合是否是另一个集合的子集
>>> s1 = {1,2,3,4,5}
>>> s2 = {1,2,3}
>>> res = s2.issubset(s1)
>>> print(res)
True
#union 并集
>>> s1 = {1,2,3,4,5}
>>> s2 = {1,2,3,7}
>>> print(s2.union(s1))
{1, 2, 3, 4, 5, 7}
#intersection 交集
>>> s1 = {1,2,3,4,5}
>>> s2 = {1,2,3,7}
>>> print(s1.intersection(s2))
{1, 2, 3}
原文：https://www.cnblogs.com/t-ym/p/11824808.html