What is the difference between a queue and a stack in Python?

What is the difference between a queue and a stack in Python?

A queue is a FIFO (First In, First Out) data structure, while a stack is a LIFO (Last In, First Out) structure.

Can you give me an example of how to implement both in Python?

Sure! You can use the collections.deque for a queue and a list for a stack. Here's a quick example:

from collections import deque

# Queue implementation
queue = deque()
queue.append('a')  # Enqueue
queue.append('b')
print(queue.popleft())  # Dequeue: 'a'

# Stack implementation
stack = []
stack.append('a')  # Push
stack.append('b')
print(stack.pop())  # Pop: 'b'

What are some use cases for each data structure?

Queues are often used in scheduling tasks, while stacks are used in backtracking algorithms, like undo features in applications.