Python Coding challenge - Day 502| What is the output of the following Python Code?

 

Code Explanation:

Line 1: Import reduce function

from functools import reduce

Explanation:

reduce() is a function from the functools module.

It repeatedly applies a function to the items of an iterable, reducing the iterable to a single cumulative value.

Line 2: Define the list numbers

numbers = [1, 2, 3, 4]

Explanation:

A list of integers is created: [1, 2, 3, 4].

Line 3: Define function f

f = lambda x: x * 2

Explanation:

This lambda function doubles the input.

Example: f(5) returns 10.

Line 4: Define function g

g = lambda lst: reduce(lambda a, b: a + b, lst)

Explanation:

g is a function that:

Takes a list lst.

Uses reduce() to sum all elements of the list.

Example: g([1, 2, 3, 4]) will compute 1 + 2 + 3 + 4 = 10.

Line 5: Combine functions and print result

print(f(g(numbers)))

Step-by-step Evaluation:

g(numbers):

Input: [1, 2, 3, 4]

Sum = 1 + 2 + 3 + 4 = 10

f(10):

10 * 2 = 20

Final Output:

20