Python Road -08-Collection

A collection is an unordered, non-repeating combination of data, and its main functions are as follows:

• Go to the weight, turn a list into a set, and then automatically go heavy.
• Relationship test, test the intersection of two sets of data, difference set, and the relationship between the set

8.1 Integrated operation

8.1.1 Common operations

#! Author:lanhan
List_1 = [1,4,5,7,3,6,7,9]
List_1 = Set (list_1)
Print (List_1,type (list_1))
List_2 = Set ([2,6,0,66,22,8,4])
Print (list_1,list_2)
List_3 = Set ([1,3,7])
#交集
Print"Intersection", List_1.intersection (list_2))
Print (List_1 & list_2)
#并集 (Remove the same)
Print"the Set", List_1.union (list_2))
Print (list_2 | list_1)
#差集 (some in list_1, not in list_2)
Print"Difference Set", List_1.difference (list_2))
Print (list_1-list_2)
Print"Difference Set", List_2.difference (list_1))
Print (list_2-list_1)
#子集 ()
Print"Subset", List_3.issubset (list_1))
#父集 ()
Print"Parent Set", List_1.issuperset (List_3))
#对称差集 (none of the other)
Print"Symmetric difference Set", List_1.symmetric_difference (list_2))
Print (list_1 ^ list_2)
# # #m没有交集则返回true
List_4 = Set ([5,6,8])
Print"return true without intersection ", List_3.isdisjoint (List_4))

8.1.2 Basic Operation

#! Author:lanhan
#添加1项
List_4 = Set ([1,3,7])
List_4.add ('a ')
Print (List_4)
#添加多项
List_4.update ([120,130])
Print (List_4)
#使用remove () can delete an item
List_4.remove (7)
Print (List_4)
#删除, if there is no value, no error
Print (List_4.discard ("ddd"))
Length of #set
Print (len (list_4))
#测试1是否是list_4的成员
Print (1 in (list_4))
#测试2是否不是list_4的成员
Print (2 not in (List_4))
#浅复制
List_5 = List_4.copy ()
Print (list_5)

Python Road -08-Collection