Python Coding challenge - Day 688| What is the output of the following Python Code?

 

Code Explanation:

1. Importing reduce

from functools import reduce

reduce is a higher-order function from Python’s functools module.

It reduces an iterable (like a list) to a single value by repeatedly applying a function.

2. Importing operator module

import operator

The operator module provides function versions of Python operators.

Example:

operator.add(a, b) is the same as a + b.

operator.mul(a, b) is the same as a * b.

3. Defining the list

nums = [2, 3, 5]

A list of integers [2, 3, 5] is created.

This is the sequence we’ll reduce using addition.

4. Using reduce with initial value

res = reduce(operator.add, nums, 10)

General form of reduce:

reduce(function, iterable, initial)

Here:

function = operator.add (adds two numbers).

iterable = nums = [2, 3, 5].

initial = 10 (starting value).

Step-by-step execution:

Start with 10 (the initial value).

Apply operator.add(10, 2) → result = 12.

Apply operator.add(12, 3) → result = 15.

Apply operator.add(15, 5) → result = 20.

So the final result is 20.

5. Printing the result

print(res)

Prints the reduced value, which is 20.

Final Output

20

Download Book - 500 Days Python Coding Challenges with Explanation