Web Reference: Description: A Deque (Double-Ended Queue) is a linear data structure that allows insertion and deletion at both ends (front and rear). This implementation uses a doubly linked list, where each node points to both its previous and next nodes. Oct 10, 2025 · Queue is a data structure that follows the First-In, First-Out (FIFO) principle, meaning the first element added is the first one to be removed. The insert and delete operations are often called enqueue and dequeue. Since Python lists has good support for functionality needed to implement queues, we start with creating a queue and do queue operations with just a few lines: But to explicitly create a data structure for queues, with basic operations, we should create a queue class instead.
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