List Append Method

In this Python programming class, we’ll cover the list append method, its purpose, syntax, flowchart, and examples. Please note that the lists are the main constructs to implement a sequence in Python.

 List Append in Python

Good Morning, we wish you had a great day. Today, we are going to teach a list method known as Append in Python.

It is one of the essential methods that you learn in a short while.

Before reading this tutorial, please polish your knowledge of Lists in Python. We will be teaching according to the Python 3 syntax. If required, you may modify them for other versions.

• Introduction to Append
• Implementation
• Program Examples
• Time Complexity

Introduction to Append

Append() is a method that allows us to append an item to a list, i.e., we can insert an element at the end of the list. It is a built-in method in python. It is one of the methods along with the extend() method which can modify a list. To call it, you need to use the following syntax.

list.append(item or object)

Here the object can be of any type, i.e., list, element, dictionary, numbers, strings, alphanumeric characters, etc.

It modifies the original list by adding an item to the end of the list. It does not have a return value.

Implementation

This method is meant only for lists. It primarily takes an item from the user and adds it to the end of the list.

The below flowchart demonstrates the functioning of the list append method:

Here is a sample program to show how to use the list append method:

List = ["23", "34", "help", "linux", "ls", "%6jwe"]

List.append("Unix")

print (List)

The below image shows the output:

List Append Examples

1. Appending an Element to the List

Car = ["Mercedes Benz", "Audi", "BMW"]

Car.append("Mahindra & Mahindra, Maruti Suzuki, TATA Motors")

print (Car)

The output of the above program is as follows.

2. Appending a List to a List

color = ["orange", "blue", "green"]

rainbow = ["purple", "teal", "cyan"]

color.append(rainbow)

print (color)

The output of the above program is as follows.

The difference between outputs after appending an element to a list and list to a list is the way access takes place.

In the above example, to access blue in the updated color list, we can type “print (color[1])” whereas if we want to access purple, we need to issue the “print (color[3][0])” command.

Time Complexity

The time complexity is O(1) which means that the List Append method has a constant interval of time for each input it appends to a list.

It does not consider the different amount of time for different inputs.