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python怎么輸出滿足條件的向量集合

錢多多2年前23瀏覽0評論

python怎么輸出滿足條件的向量集合?

集合是無序的,天生不重復的數據組合,它的作用如下:

去重,即:把一個列表變成集合,就去重了

關系測試,即:測試兩組集合的交集、并集和差集等

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}

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