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In this section, we will see how two sorted lists can be combined using the heapq module in Python. For example, if list1 = [10, 20, 30, 40] and list2 = [100, 200, 300, 400, 500], then after concatenation it will return list3 = [10, 20, 30, 40, 100, 200, 300 , 400, 500]

We will use the heapq module to accomplish this task. This module comes with Python as a standard library module. Therefore, we must import it before using it.

import heapq

The heapq module has some properties. It’s like below &

heapq.heapify method (repeatable)

It is used to transform an iterative dataset into a heap data structure.

The heapq.heappush method (heap, item)

This method is used to insert an item into the heap. Then copy the entire heap structure again.

The heapq.heappop method (heap)

This method is used to return and remove an item from the top of the heap and perform heapify on the rest.

The heapq.heappushpop method (heap, element)

This method is used to insert and paste an element into one statement.

The heapq.heapreplace method (heap, element)

This method is used to insert and paste an element into a single statement. It removes an element from the heap root, then inserts the element into the heap.

The heapq.nlargest (n, iterable, key = none) method

This method is used to return the n largest element from heap.

Method heapq.nsmallest (n, repeatable, key = None)

This method is used to return the n smallest element from the heap.

## Code example < / h2> import heapq first_list = [45, 12, 63, 95, 74, 21, 20, 15, 36] second_list = [42, 13, 69, 54, 15] firs t_list = sorted (first_list) second_list = sorted (second_list) print (’First sorted list:’ + str (first_list)) print (’Second sorted list:’ + str (second_list)) final_list = list (heapq.merge (first_list, second_list)) print (’The final list:’ + str (final_list))

## Output

First sorted list: [12, 15, 20, 21, 36, 45, 63, 74, 95] Second sorted list: [13, 15, 42, 54, 69] The final list: [12, 13, 15, 15, 20, 21, 36, 42, 45, 54, 63, 69, 74, 95]

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Warsaw | 2023-03-22

Maybe there are another answers? What How to concatenate 2 sorted arrays in Python using heapq? exactly means?. I am just not quite sure it is the best method

Warsaw | 2023-03-22

I was preparing for my coding interview, thanks for clarifying this - How to concatenate 2 sorted arrays in Python using heapq? in Python is not the simplest one. Will use it in my bachelor thesis

Vigrinia | 2023-03-22

Thanks for explaining! I was stuck with How to concatenate 2 sorted arrays in Python using heapq? for some hours, finally got it done 🤗. Checked yesterday, it works!