Python Coding challenge - Day 263| What is the output of the following Python Code?

 

Step-by-Step Explanation

1. Define the List

numbers = [1, 2, 3, 4]

A list called numbers is defined with the elements [1, 2, 3, 4].

This is the input list that we will process using the map() function.

2. Map Function with Lambda

result = list(map(lambda x: x ** 2, numbers))

What is map?

The map() function applies a given function to each item in an iterable (like a list) and returns a new map object.

Syntax:

map(function, iterable)

function: A function to apply to each element.

iterable: A list (or other iterable) whose elements will be processed.

Lambda Function

lambda x: x ** 2

lambda x: x ** 2 is an anonymous function (also called a lambda function).

It takes one input x and returns x ** 2 (the square of x).

Applying map

map(lambda x: x ** 2, numbers)

This applies the lambda function lambda x: x ** 2 to every element in the list numbers.

Convert map object to list

The result of map() is a map object, which needs to be converted into a list using list():

list(map(lambda x: x ** 2, numbers))

After conversion, this becomes the list [1, 4, 9, 16].

3. Print the Result

print(result)

The variable result contains the new list created by applying the lambda function to each element of numbers.

The result is [1, 4, 9, 16].

Final Output

The program will print:

[1, 4, 9, 16]