Web Reference: Dec 11, 2025 · Queue is a linear data structure that stores items in a First In First Out (FIFO) manner. The item that is added first will be removed first. Queues are widely used in real-life scenarios, like ticket booking, or CPU task scheduling, where first-come, first-served rule is followed. 1 day ago · In a FIFO queue, the first tasks added are the first retrieved. In a LIFO queue, the most recently added entry is the first retrieved (operating like a stack). With a priority queue, the entries are kept sorted (using the heapq module) and the lowest valued entry is retrieved first. 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: Using a Python list as a queue:
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