python thread queue

q1 = queue.Queue () # FIFO 
q2 = queue.LifoQueue () # LIFO 
q3 = queue.PriorityQueue () # priority queue (dequeue from small to large) 
initialization parameters: 
    MAXSIZE: the maximum capacity of the queue 
Examples of commonly used function: 
    GET (): the column 
    put (): enqueues 
    get_nowait (): when no element is not blocked, but directly given equivalent GET (Block = False) 
    put_nowait (): when the queue is full had not blocked, but direct given equivalent PET (Item, Block = False) 
    empty (): whether the queue is empty 
    qsize (): returns the queue size 
    (after running get ()) task_done () sends a signal to the task has been completed queue 
    join () when the queue empty (non-initial: and received task_done () signal and then performs subsequent task)