list1 = [1,2,3,4,4,4] set1 = set(list1) print(set1) set2 = {1,2,4}#不写K-V类型的,默认就是set集合 set3 = set([1,2,'1'])#必须要加中括号,与上面不一样,两种方法都是创建set集合,后者强转 print(type(set2)) print(set3) list1 = {1,2,3,4,5} list2 = {3,4,5,6,7} print(list1.union(list2))#并集 print(list1.intersection(list2))#交集 print(list1.difference(list2))#等同于list1-list2 print(list2.difference(list1))#等同于list2-list1 list1 = {1,2,3} list2 = {1,2} print(list2.issubset(list1))#判断list2是否是list1的子集,等同于list2 < list1 print() list1 = {1,2,3} list1.add(4) print(list1) list1.update([5,6])#必须是集合 print(list1) list1.remove(1) print(list1)
控制台:
{1, 2, 3, 4}
<class 'set'>
{'1', 1, 2}
{1, 2, 3, 4, 5, 6, 7}
{3, 4, 5}
{1, 2}
{6, 7}
True
{1, 2, 3, 4}
{1, 2, 3, 4, 5, 6}
{2, 3, 4, 5, 6}