Python queue Function


Queue is usually used for data exchange between threads in Python. The queue module provides manipulations of Queues.

Create a Queue object:

>>> import queue
>>> q = queue.Queue(maxsize=5)
>>> q

(queue.Queue object at 0x024D65B0)

Put item into the queue:
>>> q.put(8)




Remove an item from the queue:


>>> q.get()



8




queue module manipulates 3 types of queue:

queue.Queue(maxsize=0): FIFO queue, first in first out, the first tasks added are the first retrieved.

queue.LifoQueue(maxsize=0): last in first out.

queue.PriorityQueue(maxsize=0): the lowest valued entries are retrieved first.



queue module methods list:

q.qsize(): return the size of the Queue

q.empty(): If the Queue is empty, return True, else False

q.full(): If the Queue is full, return True, else False

q.get([block[,timeout]]): get Queue, timeout is the waiting time

q.get_nowait():
q.put([block[,timeout]]): put in Queue, timeout is the waiting time

q.put_nowait():
q.task_done(): formerly enqueued task is complete
q.join(): Blocks until all items in the Queue have been processed