What is Deque? | Stack and Queue implementation using deque in python | Code Explanation

Published: 04 September 2025
on channel: AI Algoritmics

In this video, we learn how to implement Stack and Queue in Python using the powerful deque (double-ended queue) data structure from the collections module.

What you’ll learn:

Basics of stack (LIFO) and queue (FIFO)

Why deque is better than lists for stack/queue operations

Implementing stack with append() and pop()

Implementing queue with append() and popleft()

Time complexity of stack and queue operations using deque

Why deque?

Python’s deque provides O(1) time complexity for appending and popping from both ends, making it the perfect choice for implementing stacks and queues efficiently.

This video is beginner-friendly and part of my AI Algorithms playlist.
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