Python12: Collection

Set is a set of elements to be weighed.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) Print (list_1)

Output:

{1, 2, 3, 4, 5, 6, 7, 8} Process finished with exit code 0

Explain:

sets the list_1 for the collection, which is bad for printing.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_2 = Set ([2,6,0,66,22,8,4]) Print (list_1,list_2) Print (List_1.intersection (list_2)) #print (List_1 & List_2) Print (List_1.union (list_2)) #print (list_1 | list_2) Print (List_1.difference (list_2)) # Print (list_1-list_2)

Output:

{1, 2, 3, 4, 5, 6, 7, 8} {0, 2, 66, 4, 6, 8, 22} {8, 2, 4, 6} {0, 1, 2, 3, 4, 5, 6, 7, 8, 66, 22} {1, 3, 5, 7} Process finished with exit code 0

Explanation:the equivalent operation is behind the "#" sign.

List_1.intersection (list_2): The intersection of two sets.

List_1.union (list_2): The set of two sets.

List_1.difference (list_2): The difference set of two sets.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_2 = Set ([2,6,0,66,22,8,4]) Print (List_1.issubset (list_2)) # Print (List_1 < list_2) Print (List_1.issuperset (list_2)) # print (List_1 > List_2)

Output:

False False Process finished with exit code 0

Explanation:the equivalent operation is behind the "#" sign.

List_1.issubset (list_2): determines whether List_1 is a subset of List_2.

List_1.issuperset (list_2): Determines whether list_1 is The parent set of list_2.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_2 = Set ([2,6,0,66,22,8,4]) Print (List_1.symmetric_difference (list_2)) # print (list_1 ^ list_2)

Output:

{0, 1, 66, 7, 3, 22, 5} Process finished with exit code 0

Explanation:the equivalent operation is behind the "#" sign.

List_1.symmetric_difference (list_2): The set of two sets, removing the intersection part.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_2 = Set ([2,6,0,66,22,8,4]) Print (List_2.isdisjoint (list_1))

Output:

False Process finished with exit code 0

Explain:

List_2.isdisjoint (list_1): Returns True if two sets do not have an intersection .

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_1.add (123) Print (list_1)

Output:

{1, 2, 3, 4, 5, 6, 7, 8, 123} Process finished with exit code 0

Explain:

List_1.add (123): Adds a collection element.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_1.update ([12,23,34]) Print (list_1)

Output:

{1, 2, 3, 4, 5, 6, 7, 8, 34, 12, 23} Process finished with exit code 0

Explain:

List_1.update ([12,23,34]): Also an element that adds a collection.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_1.remove (6) Print (list_1)

Output:

{1, 2, 3, 4, 5, 7, 8} Process finished with exit code 0

Explain:

List_1.remove (6): Removes the element from the collection.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_1.pop () Print (list_1)

Output:

{2, 3, 4, 5, 6, 7, 8} Process finished with exit code 0

Explain:

List_1.pop (): Removes the element from the collection, starting with the default deletion.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) List_1.discard (123) Print (list_1)

Output:

{1, 2, 3, 4, 5, 6, 7, 8} Process finished with exit code 0

Explain:

List_1.discard (123): removes the element from the collection, unlike the Remove (), if there is no such element in the collection, the error is not, and remove will error.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) n = Len (list_1) Print (n)

Output:

8 Process finished with exit code 0

Explain:

n = Len (list_1): The length of the collection.

Method Operation:

#!/usr/bin/env python #-*-Coding:utf-8-*- #Author: Mclind List_1 = [1,2,3,4,5,6,6,7,8] List_1 = Set (list_1) Print (2 in list_1)

Output:

True Process finished with exit code 0

Explain:

Print (2 in list_1): Determines whether it is in the collection.

Python12: Collection