![]() The queue is a linear data structure useful when accessing data in a first-in, first-out fashion. In this article, we implemented a queue in Python. ![]() The full implementationīelow is the full implementation and some test cases: Conclusion This method has a constant time complexity O(1). The size method returns the length of the queue. As with dequeue, we need to return None if the queue is empty to avoid an Inde圎rror. The peek method returns the item at the front of the queue (index 0). To avoid getting an Inde圎rror when popping from an empty queue, we first check if it is empty and return None. The dequeue method returns and removes the item at the front of the queue, using the popleft method from deque. The enqueue method adds an item to the back of the queue, using the append method from deque. The is_empty method returns True if the queue is empty. At the top of the module, we must import deque from collections. We define a Queue class with a constructor that instantiates an empty deque and a _str_ method that returns a readable representation of the queue object. Let’s go over our queue implementation using deques.
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