1. 集合类型定义
(1)集合是多个元素的无序组合
- 集合类型与数学中的集合概念一致
- 集合元素之间无序,每个元素唯一,不存在相同元素
- 集合元素不可更改,不能是可变数据类型
- 集合使用{}表示,元素间用英文逗号分隔
- 建立集合类型用{}或set()
- 建立空集合类型,必须使用set()
a = {"python",256,("sbvsb",251)} print(a) b = set("python") print(b) c = {"python",256,"python",256} print(c)
2. 集合操作符
- 6个操作符
- 4个增强操作符
3. 集合处理方法
4. 集合类型应用场景
(1)包含关系比较
>>>"p" in {‘p","y","t","h"} True >>>{‘p","y"} <= {‘p","y","t","h"} True
(2)数据去重:集合数据所有元素无重复
>>>ls = [‘p","p","y","y","t","h"] >>>s = set(ls) {‘p","y","t","h"} >>>ls = list(s) [‘p","y","t","h"]
总结
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原文链接:https://blog.csdn.net/m0_55697123/article/details/119190849