List in python Programming language

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List in a Python Programming language

In this tutorial, we will discuss the list in python programming language.

The list is a data type in python that is used to store the sequence of data. When creating the list, we can use comma to separate the values between two square bracket- it looks like an array format. Each element of a sequence is named with a variable and assigned a number. It is called an index. Its position in the index is from first to last zero(the first element is 0 and the last element is on)
Syntex of list
list=[element 1,element 2, element 3, element 4, element 5,……., element n];
List index
For an example of the list
Languages=[“php”,”html”,”java”,”C”, “C++”,”vb.net”,”Asp.net”,”jquary”];
Numbers=[“45, “67”, “89”, “76”, “54”, “43”, “32”, “91”];

alphabets=[“a”,”b”,”c”,”d”,”e”,”f”,”g”,”h”];

List may be contain multiple type of data

multilist=[“physics”,”chemistry”,”1998″,”2017″];

1. Accessing value in a list

We can accessing data in list using index indice of list

Languages=[“php”,”html”,”java”,”C”, “C++”,”vb.net”,”Asp.net”,”jquary”];
Numbers=[“45”, “67”, “89”, “76”, “54”, “43”, “32”, “91”];

alphabets=[“a”,”b”,”c”,”d”,”e”,”f”,”g”,”h”];

multilist=[“physics”,”chemistry”,”1998″,”2017″];

We can seperate every element of list using follwing code

print(Languages[0]); – Seperate 0 index element from list of Language

print(Numbers[2]); – Seperate 3 index element from list of Numbers

print(multilist[3]); – Seperate 4 index element from list of multilist

 

List in python Programming language
Example

the output of the above program

 
Languages[0] – php
Numbers[2] – 89
alphabets[6] – g

multilist[3] – 2017

2. Updating list elements


We can update a single or multiple elements of the list using assign operator given below

print(“New value in the list of languages available in index 2:”)

Languages[2]=”CSS”;  // insert to list of Languages

List in python Programming language
Example

 

Output above program

Value in the list of languages available in index 2:
java
New value in the list of languages available in index 2:
New value in languages available in index 2:
CSS


3. Delete Elements of list

 

To remove the list element, we can use del statement or remove() method

multilist=[“physics”,”chemistry”,”1998″,”2017″];

print(multilist)

del(multilist[2]) // using del statement

print(multilist)  //print multilist after del index [2] element

multilist.remove(multilist[2]) // remove index[2] element from new list

List in python Programming language
Example

 

Output of above program

[‘physics’, ‘chemistry’, ‘1998’, ‘2017’]
[‘physics’, ‘chemistry’, ‘2017’]
[‘physics’, ‘chemistry’]

 


4.Insert Elements of the list


We can insert elements of list using insert() method

Numbers=[“45”, “67”, “89”, “76”, “54”, “43”, “32”, “91”];   // list

print(number)

Number.insert(3,100)    // use insert method

print(number)

List in python Programming language
Example

Output above code

[’45’, ’67’, ’89’, ’76’, ’54’, ’43’, ’32’, ’91’]
[’45’, ’67’, ’89’, 100, ’76’, ’54’, ’43’, ’32’, ’91’100]

 

5.Count Elements of the list


We can count element of the list using count() method

Number=[’45’, ’67’, ’89’, 100, ’76’, ’54’, ’43’, ’32’, ’91’100];

print(Number)

Number.count(‘100’)    // use count method

print(Number)

Output of above program

[’45’, ’67’, ’89’, ‘100’, ’76’, ’54’, ’43’, ’32’, ’91’, ‘100’]

2


6.Reverse Elements of the list


We can change reverse order element of the list using reverse() method

Number=[’45’, ’67’, ’89’, 100, ’76’, ’54’, ’43’, ’32’, ’91’100];

print(Number)

Number.reverse()

print(Number)

Output above program

[’45’, ’67’, ’89’, ‘100’, ’76’, ’54’, ’43’, ’32’, ’91’, ‘100’]
[‘100′, ’91’, ’32’, ’43’, ’54’, ’76’, ‘100’, ’89’, ’67’, ’45’]

 

7.Append Elements of list

 

Languages=[“php”,”html”,”java”,”C”, “C++”,”vb.net”,”Asp.net”,”jquary”];

print(Number)

Number.Append([“css”,”Js”,”ruby”])

print(Number)


Output above program

[‘php’, ‘html’, ‘java’, ‘C’, ‘C++’, ‘vb.net’, ‘Asp.net’, ‘jquary’]

[‘php’, ‘html’, ‘java’, ‘C’, ‘C++’, ‘vb.net’, ‘Asp.net’, ‘jquary’, [‘css’, ‘Js’, ‘ruby’]]


8.pop Elements of list

 

Languages=[“php”,”html”,”java”,”C”, “C++”,”vb.net”,”Asp.net”,”jquary”];

print(Languages)

print(Languages.pop(0))

print(Languages)

List in python Programming language
Example
Output

[‘php’, ‘html’, ‘java’, ‘C’, ‘C++’, ‘vb.net’, ‘Asp.net’, ‘jquary’]
php
[‘html’, ‘java’, ‘C’, ‘C++’, ‘vb.net’, ‘Asp.net’, ‘jquary’]



9.sort Elements of list


We can sort object of a list

Languages=[“php”,”html”,”java”,”C”, “C++”,”vb.net”,”Asp.net”,”jquary”];

print(Languages)

Languages.sort();

print(Languages)

List in python Programming language
Example




Output

[‘php’, ‘html’, ‘java’, ‘C’, ‘C++’, ‘vb.net’, ‘Asp.net’, ‘jquary’]

[‘Asp.net’, ‘C’, ‘C++’, ‘html’, ‘java’, ‘jquary’, ‘php’, ‘vb.net’]

 

10.index Elements of list


Languages=[“php”,”html”,”java”,”C”, “C++”,”vb.net”,”Asp.net”,”jquary”];

print(Languages)

print(Languages.index(“java”));

List in python Programming language
Example








Output

[‘php’, ‘html’, ‘java’, ‘C’, ‘C++’, ‘vb.net’, ‘Asp.net’, ‘jquary’]

2

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