集合是無序的，天生不重復的數據組合，它的作用如下：

一、集合常用方法總結

二、定義

1、語法

>>> name_1 = [1,2,3,4,7,8,7,10]#把列表轉換為集合>>> name_1 = set(name_1)#轉換后，去重>>> print(name_1,type(name_1)){1, 2, 3, 4, 7, 8, 10} <class 'set'>

 三、關系測試

1、交集(intersection())

>>> name_1 = [1,2,3,4,7,8,7,10]>>> name_2 = [1,3,5,8,10]>>> name_1 = set(name_1)>>> name_2 = set(name_2)#輸出結果>>> name_1.intersection(name_2){8, 1, 10, 3}

2、并集(union())

>>> name_1 = [1,2,3,4,7,8,7,10]>>> name_2 = [1,3,5,8,10]>>> name_1 = set(name_1)>>> name_2 = set(name_2)#輸出結果>>> name_1.union(name_2){1, 2, 3, 4, 5, 7, 8, 10}

 3、差集(difference())

>>> name_1 = [1,2,3,4,7,8,7,10]>>> name_2 = [1,3,5,8,10]>>> name_1 = set(name_1)>>> name_2 = set(name_2)#輸出結果>>> name_1.difference(name_2){2, 4, 7}

 特別提示：差集取的是數值在第一個集合中，但是不在第二個集合中（在我不在你）

4、issubset()

判斷一個集合是否是另一個集合的子集

>>> name_1 = [1,2,3,4,7,8,7,10]>>> name_3 = [1,2,3,4]>>> name_1 = set(name_1)>>> name_3 = set(name_3)#輸出結果>>> name_3.issubset(name_1)True

 5、issuperset()

判斷一個集合是否是另一個集合的父集

>>> name_1 = [1,2,3,4,7,8,7,10]>>> name_3 = [1,2,3,4]>>> name_1 = set(name_1)>>> name_3 = set(name_3)#輸出結果>>> name_1.issuperset(name_3)True

 6、對稱差集(symmetric_difference())

 把兩個集合沒有交集的數值取出來

>>> name_1 = [1,2,3,4,7,8,7,10]>>> name_2 = [1,3,5,8,10]>>> name_1 = set(name_1)>>> name_2 = set(name_2)#輸出結果>>> name_1.symmetric_difference(name_2){2, 4, 5, 7}

 7、isdisjoint()

判斷兩個集合是否有交集，沒有交集，則返回True

>>> name_1 = [1,2,3,4,7,8,7,10]>>> name_2 = [1,3,5,8,10]>>> name_3 = [11]>>> name_1 = set(name_1)>>> name_2 = set(name_2)>>> name_3 = set(name_3)#有交集>>> name_1.isdisjoint(name_2)False#無交集>>> name_1.isdisjoint(name_3)True