What is the deque implementation in Python's collections module?

What is the deque implementation in Python's collections module?

The deque, or double-ended queue, is a data structure in Python's collections module that allows you to add and remove elements from both ends efficiently.

How does it differ from a list?

Unlike lists, deques provide O(1) time complexity for appending and popping elements from both ends, making them more efficient for certain use cases.

Can you show me a simple example of using deque?

Sure! Here's a basic example:

from collections import deque

# Create a deque
my_deque = deque([1, 2, 3])

# Append to the right
my_deque.append(4)

# Append to the left
my_deque.appendleft(0)

# Pop from the right
my_deque.pop()

# Pop from the left
my_deque.popleft()

What are some common use cases for deque?

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