What are some examples of queue implementations in Python?

What are some examples of queue implementations in Python?

In Python, you can implement queues using lists, the queue module, or collections.deque. Would you like examples?

Yes, please provide examples for each method.

Sure! For a list-based queue, you can use append() to enqueue and pop(0) to dequeue. For the queue module, you can use Queue() for thread-safe operations. Lastly, collections.deque allows fast appends and pops from both ends.

Can you show me the code for these implementations?

Absolutely! Here’s a simple example for each:

1. List-based Queue:

queue = []
queue.append(1)  # Enqueue
queue.pop(0)     # Dequeue

2. Using queue module:

from queue import Queue
q = Queue()
q.put(1)  # Enqueue
q.get()    # Dequeue

3. Using collections.deque:

from collections import deque
d = deque()
d.append(1)  # Enqueue
d.popleft()   # Dequeue

Thanks! Are there any performance considerations I should be aware of?

Yes, using lists can be inefficient for large queues due to O(n) complexity for dequeue operations. The queue module and collections.deque are more efficient, with O(1) complexity for both enqueue and dequeue.