Python Coding challenge - Day 786| What is the output of the following Python Code?

 

Code Explanation:

1. Importing reduce from functools

from functools import reduce

reduce() is a function from the functools module.

It applies a function cumulatively to the items of an iterable (like a list), reducing it to a single value.

Example idea: reduce(lambda x, y: x + y, [1, 2, 3]) → ((1+2)+3) → 6

2. Creating a List

nums = [2, 4, 6]

A list nums is created with three integers: [2, 4, 6].

3. Using reduce() to Multiply All Elements

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

reduce() takes the lambda function lambda x, y: x * y and applies it across all items in nums.

Calculation step-by-step:

Start with first two: 2 * 4 = 8

Multiply result with next element: 8 * 6 = 48

So, prod = 48.

4. Appending a New Element to the List

nums.append(3)

Adds the number 3 to the end of the list.

Now, nums = [2, 4, 6, 3].

5. Using reduce() to Sum All Elements (with an Initial Value)

s = reduce(lambda x, y: x + y, nums, 5)

This time, the lambda function adds elements.

The third argument 5 is an initial value, meaning the reduction starts from 5.

Step-by-step:

Start with x = 5, y = 2 → 5 + 2 = 7

Next: x = 7, y = 4 → 11

Next: x = 11, y = 6 → 17

Next: x = 17, y = 3 → 20

So, s = 20.

6. Printing the Results

print(prod, s)

Prints both computed values on one line separated by a space.

Output:

48 20

Final Output

48 20

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