library

collections.deque

collections.deque is a double-ended queue implementation in Python's standard library collections module, providing efficient O(1) appends and pops from both ends. It is designed for fast, thread-safe operations and is ideal for implementing queues, stacks, and sliding window algorithms where frequent insertions and deletions occur at both ends.

Also known as: deque, double-ended queue, collections deque, Python deque, queue from collections
🧊Why learn collections.deque?

Developers should use collections.deque when they need a data structure that supports fast operations at both ends, such as in breadth-first search algorithms, task scheduling, or maintaining a history buffer. It is particularly useful over Python lists when performance for pop(0) or insert(0, item) operations is critical, as lists have O(n) complexity for these operations.

Compare collections.deque

collections.deque vs List→collections.deque vs Queue Queue→collections.deque vs Collections Defaultdict→

Learning Resources

📄
Python Documentation: collections.deque
docs
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📝
Real Python: Python's deque: Implement Efficient Queues and Stacks
tutorial
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📝
GeeksforGeeks: Deque in Python
tutorial
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🎬
YouTube: Python Deque Tutorial
video
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Related Tools

PythonData StructuresCollections ModuleQueueStack

Alternatives to collections.deque

ListQueue QueueCollections Defaultdict