Usage of the Python list tuple dictionary

First, List

The form of a list is denoted by [], [] There are ', ', ' separate list contents. Lists can also be nested.

Syntax: eg.name1 = [' 1lo ', ' 2ng ', ' 3er ', ' 4long '];

Print (NAME1);

Print: [' 1lo ', ' 2ng ', ' 3er ', ' 4long ']

Insert, add, Delete, change, and find actions on a list.

1. Insert (Pos,val) POS is the position index of the list, Val is the added content

Name1.insert (1, ' 5xxx ');

Print (NAME1);

Print: [' 1lo ', ' 5xxx ', ' 2ng ', ' 3er ', ' 4long ']

2. Add append (val) to add content at the end of the list

Name1.append (' 6xxx ')

Print: [' 1lo ', ' 5xxx ', ' 2ng ', ' 3er ', ' 4long ', ' 6xxxx ']

3. Delete del, Remove,clear,pop

A, Del can specify the deletion of the corresponding position of the element

Del Name1[3];

Print: [' 1lo ', ' 5xxx ', ' 2ng ', ' 4long ', ' 6xxx ']

B. Remove removes the specified element

Name1.remove (' 5xxx ');

Print: [' 1lo ', ' 2ng ', ' 4long ', ' 6xxx ']

C, pop remove the last element

Name1.pop ();

[' 1lo ', ' 2ng ', ' 4long ']

D, clear empty list elements

Name1.clear ();

Print: "Empty"

NAME1 = ['1lo','2ng','3er','4long'];Print(name1); Name1.insert (1,'5xxx');Print(name1); Name1.append ('6xxx');Print(name1);delName1[3];Print(name1); Name1.remove ('5xxx');Print(name1); Name1.pop ();Print(name1); Name1.clear ();Print(NAME1);

4. Change (Modify)

name1[2]= ' 7eee '; #不存在的话, the system will error

Print: [' 1lo ', ' 2ng ', ' 7eee ', ' 4long ']

5. Find

Print (Name1.index (' 7eee '));

Get Subscript: 2

Two, the meta-group

A tuple is a list that cannot be changed. Also called a read-only list.

Only count, and index two operations.

Third, the dictionary

A dictionary of Key-value data types. The same dictionary can also be nested.

Grammar: eg.

Info1 = {
    ' stu1101 ': ["Tenglan Wu", "35", "155"],
    ' stu1102 ': ["Longze Luola", "36", "160"],
    ' stu1104 ': ["Xiaoze Maliya", "30", "165"],
}

Features of the dictionary:

Dict is disordered.

Key must be unique

Print: {' stu1104 ': [' Xiaoze Maliya ', ' ['] ', ' 165 '], ' stu1101 ': [' Tenglan Wu ', ' ' 155 ', ' stu1102 ']: [' Longze Luola ', ' 36 ', ' 160 ']}

At the same time the dictionary can implement multilevel nesting.

Usage of the Python list tuple dictionary