Python Coding challenge - Day 417| What is the output of the following Python Code?

 

Code Explanation:

1. Importing the Required Library

import heapq

heapq is a Python library that provides efficient heap operations.

The heapq.nsmallest() function is used to find the k smallest elements from a list based on a specific key.

2. Defining the Function

def k_closest(points, k):

    distance = lambda x: x[0]**2 + x[1]**2

    return heapq.nsmallest(k, points, key=distance)

points: List of coordinates representing points on a 2D plane.

k: Number of closest points to find.

distance: A lambda function that calculates the Euclidean distance squared from the origin using the 

​heapq.nsmallest(): Returns the k closest points based on their calculated distances.

3. Applying heapq.nsmallest()

The function finds the two closest points by comparing the distances:

(3,3) → Distance = 18

(-2,4) → Distance = 20

(5,-1) → Distance = 26

The two points with the smallest distances are (3,3) and (-2,4).

4.Final Output

print(k_closest([[3,3],[5,-1],[-2,4]], 2)) # Output?

The output is:

[[3,3], [-2,4]]