fastqueue

Single-ended fast queues built in C tuned for Python.

Requirements

python 3.7+

Installation

To install fastqueue, using pip:

pip install fastqueue-lib

Quickstart

For general use cases fastqueue.Queue() objects are tuned to perform well.
The enqueue and dequeue methods perform well over a large sequence of arbitrary operations.
fastqueue.Queue() supports many standard sequence methods similar to lists.
fastqueue.Queue() minimizes memory usage but maintains the fast queue speeds.

>>> from fastqueue import Queue
>>> queue = Queue()
>>> queue.extend(['🚒', '🛴'])
>>> queue[0]
'🚒'
>>> '🛴' in queue
True
>>> queue.enqueue('🚅')
>>> queue.enqueue('🚗')
>>> queue[-1]
'🚗'
>>> [queue.dequeue() for _ in range(len(queue)) ]
['🚒', '🛴', '🚅', '🚗']

For more specialized cases fastqueue.QueueC() objects are tuned to perform well.
The interface for fastqueue.QueueC() is identical to fastqueue.Queue().
The enqueue and dequeue methods perform similarly well over a large sequence of arbitrary operations.
fastqueue.QueueC() handles memory differently by doubling the capacity when full.
This increases the complexity but maintains fast amortized cost.
The benefit of this approach is even faster __getitem__ and __setitem__ speeds

>>> from fastqueue import QueueC

>>> queue_c = QueueC()
>>> queue_c.extend(['🚒', '🛴'])
>>> queue_c[0]
'🚒'
>>> '🛴' in queue_c
True
>>> queue_c.enqueue('🚅')
>>> queue_c.enqueue('🚗')
>>> queue_c[-1]
'🚗'
>>> [queue_c.dequeue() for _ in range(len(queue_c)) ]
['🚒', '🛴', '🚅', '🚗']

Another alternative is fastqueue.LockQueue() which supports all queue operations.
fastqueue.LockQueue() is built as a thread-safe alternative to the other queue types.