1、不同元素组成
2、无序
3、集合中元素必须是不可变类型
s = set("hello")print(s)
s = set(["alex","alex","sb"])print(s)
1、添加s = {1,2,3,4,5,6}s.add("s")s.add("3")s.add(3)print(s)
2、清空
s = {1,2,3,4,5,6}s.clear()print(s)3、拷贝