I recently decided to work with Python 3 and I have questions regarding queues. As far as I understand the queue in the queue library is adapted for multithreaded programs. I assume that that queue is not as efficient as the simple queue (if I am wrong please correct). Therefore, I found that there is a deque from collections library which resembles deque in C++. Am I right that that's what competitive Python programmers use (for example, BFS problems)?