What are the uses of deque in Python?

What is a deque in Python?

A deque, or double-ended queue, is a data structure that allows you to add and remove elements from both ends efficiently.

What are some common uses of deque?

Deques are often used for implementing queues, stacks, and for scenarios where you need fast appends and pops from both ends.

Can you give me an example of using deque?

Sure! You can use deque to create a simple queue like this:

from collections import deque

queue = deque()
queue.append('a')
queue.append('b')
print(queue.popleft())  # Outputs: 'a'

Are there any performance benefits of using deque?

Yes, deques provide O(1) time complexity for append and pop operations from both ends, making them more efficient than lists for these operations.