Python Coding challenge - Day 826| What is the output of the following Python Code?

 

Code Explantion:

1. Importing Required Modules

from functools import reduce

import operator

functools.reduce()

→ A higher-order function that applies a given function cumulatively to the items of a sequence, reducing it to a single value.

Example: reduce(func, [a, b, c]) → func(func(a, b), c)

operator

→ Provides function forms of built-in operators like addition (operator.add), multiplication (operator.mul), etc.

2. Defining the List of Numbers

nums = [2, 4, 6]

Creates a list nums containing three integers: 2, 4, 6.

This will be used as the input for our reduce() function.

Output (conceptual):

nums = [2, 4, 6]

3. Using reduce() to Multiply All Elements

res = reduce(operator.mul, nums)

Let’s understand this step-by-step:

operator.mul → multiplies two numbers (same as using *).

reduce(operator.mul, nums) → performs:

((2 * 4) * 6)

Step-by-step calculation:

First operation → 2 * 4 = 8

Next operation → 8 * 6 = 48

So,

res = 48

Output (conceptual):

res = 48

4. Subtracting the Sum of the List

print(res - sum(nums))

Let’s compute it:

Expression Value

sum(nums) 2 + 4 + 6 = 12

res 48

res - sum(nums) 48 - 12 = 36

Printed Output:

36

700 Days Python Coding Challenges with Explanation