Using Poetry Dependency Management tool in Python

Square Each Odd Number in a List using List Comprehension

Last Updated : 05 Feb, 2025

The task of squaring each odd number in a list using list comprehension in Python involves iterating through the list, identifying odd numbers, and squaring them while leaving the even numbers unchanged. For example, given a list a = [1, 2, 3, 4, 5, 6, 7], the goal is to square each odd number, resulting in the list [1, 9, 25, 49] while skipping the even numbers.

Using list comprehension

List comprehension is a efficient way to iterate over a list and perform operations like squaring odd numbers. It provides a concise syntax, avoiding the need for explicit loops and intermediate steps, resulting in cleaner code.

Python

a = [1, 2, 3, 4, 5, 6, 7]

res = [i * i for i in a if i % 2 != 0]
print(res)

Explanation: List comprehension iterates over the list a, filtering out even numbers with if i % 2 != 0 and squares each odd number. The squared values are stored in the list res .

Using conditional list comprehension

We can use an inline conditional within list comprehension to square odd numbers and replace even numbers with a default value like 0 . This method allows for flexible handling of both odd and even values in a single expression.

Python

a = [1, 2, 3, 4, 5, 6, 7]

res = [i*i if i % 2 != 0 else 0 for i in a]
print(res)

Explanation: List comprehension iterates over the list a and for each element i, it checks if the number is odd (i % 2 != 0). If the number is odd, it squares the number (i * i), otherwise, it replaces the even number with 0.

Using filter()

Combining filter() with list comprehension enables us to first extract odd numbers and then square them. The filter() function is used to create a list of odd numbers, which is then processed by list comprehension to apply the squaring operation.

Python

a = [1, 2, 3, 4, 5, 6, 7]

res = [i * i for i in filter(lambda x: x % 2 != 0, a)]
print(res)

Explanation: This code filters out even numbers from the list a and then squares the remaining odd numbers.

Using Poetry Dependency Management tool in Python

sravankumar_171fa07058

Improve

Article Tags :

Practice Tags :

Similar Reads

Python List Comprehension Using If-Else

List comprehension with if-else in Python is a concise way to apply conditional logic while creating a new list. It allows users to add elements based on specific conditions and even modify them before adding. Using if-else Inside List ComprehensionThis is the simplest and most efficient way to appl

Reducing Execution time in Python using List Comprehensions

In Python, list comprehensions provide a concise way to create lists while reducing execution time. They replace loops and map/filter functions for many use cases, improving readability and efficiency. The task is to explore different scenarios where list comprehensions can reduce execution time com

Python List Comprehension With Two Lists

List comprehension allows us to generate new lists based on existing ones. Sometimes, we need to work with two lists together, performing operations or combining elements from both. Let's explore a few methods to use list comprehension with two lists. Using zip() with List ComprehensionOne of the mo

4 Tips To Master Python List Comprehensions

Python's list comprehensions offer a concise and powerful way to create lists. They allow you to express complex operations in a single line of code, making your code more readable and efficient. In this article, we will explore four tips to master Python list comprehensions with five commonly used

Python Program to Check if a Number is Perfect Square in List

In this article, we will understand how to print all perfect squares from a list in Python using the list comprehension and math module. The main function that is present in the math module that we will be using is the sqrt() and floor() function. Let's see the output of these two functions one by o

Python program to count Even and Odd numbers in a List

In Python working with lists is a common task and one of the frequent operations is counting how many even and odd numbers are present in a given list. The collections.Counter method is the most efficient for large datasets, followed by the filter() and lambda approach for clean and compact code. Us

Python Program to Print Largest Even and Largest Odd Number in a List

Auxiliary Given a list. The task is to print the largest even and largest odd number in a list. Examples: Input: 1 3 5 8 6 10 Output: Largest even number is 10 Largest odd number is 5 Input: 123 234 236 694 809 Output: Largest odd number is 809 Largest even number is 694 The first approach uses two

Print odd numbers in a List - Python

We are given a list and our task is to print all the odd numbers from it. This can be done using different methods like a simple loop, list comprehension, or the filter() function. For example, if the input is [1, 2, 3, 4, 5], the output will be [1, 3, 5]. Using LoopThe most basic way to print odd n

Python Program to Check if a Number is Odd or Even

Even Numbers are exactly divisible by 2 and Odd Numbers are not exactly divisible by 2. We can use modulo operator (%) to check if the number is even or odd. For even numbers, the remainder when divided by 2 is 0, and for odd numbers, the remainder is 1. In this article, we will learn how to check i

Sum of columns of a 2-D Matrix where first element is odd

Given a matrix mat[][], the task is to print the sum of the columns where the first element is odd. Examples: Input: mat[][] = { {8, 2, 3, 5}, {9, 8, 7, 6}, {1, 2, 5, 5} } Output: 31 Only the third and the fourth columns start with an odd element. And, sum = 3 + 7 + 5 + 5 + 6 + 5 = 31 Input: mat[][]