How to create a Nested list in Python? Complete Guide

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How to create a nested list in Python? Python is a beneficial and versatile programming language, and one of its properties is the capability of Python to nested lists. A Nested list in Python is a collection of lists where each list can hold any kind or type of data. For example, a list that contains three lists, each of which contains three numbers, could look like this: [[1,2,3], [4,5,6], [7,8,9]].

nested list in python

Here, we will discuss Python to create and use nested lists in Python and how they can simplify and speed up your code.

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What are Nested Lists in Python 

Nested Lists in Python are lists that contain other lists. They help store multiple sets of data in a single structure. Nested lists are commonly used to represent multi-dimensional arrays and matrices, and they can also be used to represent hierarchical data structures such as trees. Creating a nested list is simple; all that is needed is to enclose each inner list in square brackets. 

nested list

The following example creates a nested list with two inner lists: list = [[1,2,3], [4,5,6]]. Accessing elements of a nested list is similar to accessing elements of a regular list. 

To access an element within an inner list, the index of the inner list must be specified first, followed by the index within the inner list. The following example accesses

Types of methods to create Nested Lists

HPythone ways to create a nested list in Python

Append method

The append() method offers a simple way to add new elements to the end of any list, giving you greater flexibility when organizing data. This method modifies the list but does not return anything. 


To use the append() method, you can specify the item to be added as an argument in the parentheses. 


list = [1,2,3] 



Output: [1, 2, 3, 4]

Extend method

Extend list is a built-in Python method that allows you to add elements to an existing list. This powerful method offers a versatile way to expand an iterable, like a list, tuple, or string. By adding each element to the end of your selection, you can quickly extend its contents without manually inputting every item one at a time! It is helpful to quickly add multiple items to a list without writing a loop or list comprehension. For example, if you want to extend a list called my_list with a list of numbers, you would do the following:


my_list = [ ]


This will add the elements 1, 2, 3, 4, and 5 to the my_list list.

Comprehension method

Make a Python using the comprehension method in Python. Write your expression in the brackets followed by a for clause. For example, to make a number list of 1 to 10, the code is as follows: 


my_list = [x for x in range(1, 11)] 

This single line of code creates a list of numbers from 1 to 10. List comprehensions offer an efficient and elegant way to generate lists without needing a lot of tedious coding. They make it easy for developers to quickly create what they need, allowing them more time to focus on the finer details of their projects.

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Benefits of using a nested list

These are the benefits of creating a nested list in Python

Improved readability

Nested lists can help improve the readability of complex data structures. By nesting lists, you can visually group related items, making it easier to understand the structure of the data.

Easier data access

Nested lists make it easier to access specific elements of a data structure. Easily access data elements within lists by arranging them in nesting layers – making the perfect organizational structure!

Flexible data structure

Nested lists allow you to create a flexible data structure that modifies and adapts easily to changing data requirements, making them ideal for creating dynamic data structures.

Data manipulation

Nested lists make it easier to manipulate data by allowing you to sort, search, and filter data elemenPythonckly.

Here is one example of a nested list:


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Nested lists in Python are robust data structures that allow us to store and access data in multiple dimensions. They provide a way to store and access data efficiently and flexibly. Investing time and effort in studying nested lists enables capabilities to tackle even the most intricate challenges. With their versatile nature, these data structures, employees build robust programs that bring revolutionary solutions to life. With the help of these data structures, developers can create more efficient and effective code.

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