What are the differences between deque and list in Python?

What are the differences between deque and list in Python?

In Python, a list is a dynamic array, while a deque (double-ended queue) allows fast appends and pops from both ends.

Can you give me an example of how to use a deque?

Sure! You can use collections.deque to create a deque. For example:

from collections import deque
my_deque = deque([1, 2, 3])
my_deque.append(4)  # Adds 4 to the right
my_deque.appendleft(0)  # Adds 0 to the left
print(my_deque)  # Output: deque([0, 1, 2, 3, 4])

How does the performance of deque compare to list?

Deques provide O(1) time complexity for append and pop operations from both ends, while lists have O(n) for these operations at the beginning.

When should I use a deque instead of a list?

Use a deque when you need fast appends and pops from both ends, like in queue or stack implementations.