Python Coding challenge - Day 780| What is the output of the following Python Code?

 

Code Explanation:

1. Import the reduce function

from functools import reduce

The reduce() function is not a built-in — it lives in Python’s functools module.

So, you need to import it before using.

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

2. Create a list of numbers

nums = [2, 3, 4]

A list named nums is created with three integers.

Initially:

nums = [2, 3, 4]

3. Calculate the product of all numbers using reduce()

product = reduce(lambda x, y: x * y, nums)

reduce() applies the function lambda x, y: x * y to the list elements cumulatively.

Here’s how it works step by step:

Takes first two elements → 2 * 3 = 6

Takes result and next element → 6 * 4 = 24

Final result: 24

So:

product = 24

In essence:

reduce() turned [2, 3, 4] → ((2 * 3) * 4) → 24

4. Add another number to the list

nums.append(5)

Adds 5 to the end of the list.

Now:

nums = [2, 3, 4, 5]

5. Calculate the sum of all numbers (with an initializer)

total = reduce(lambda x, y: x + y, nums, 10)

Again uses reduce(), but this time to sum the numbers.

The third argument 10 is the initializer — it acts as a starting value for the reduction.

Step-by-step:

Start with x = 10 (initializer)

Add first element → 10 + 2 = 12

Add next element → 12 + 3 = 15

Add next → 15 + 4 = 19

Add last → 19 + 5 = 24

So:

total = 24

6. Print the results

print(product, total)

Prints both computed values:

product = 24

total = 24

Output:

24 24

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