Python threads using Queue

#Ref:

#https://stackoverflow.com/questions/47900922/split-list-into-n-lists-and-assign-each-list-to-a-worker-in-multithreading

#https://pymotw.com/2/Queue/

#The Queue module provides a FIFO implementation suitable for multi-threaded programming. 

#It can be used to pass messages or other data between producer and consumer threads safely. 

#Locking is handled for the caller, so it is simple to have as many threads as you want working with the same Queue instance. 

#A Queue’s size (number of elements) may be restricted to throttle memory usage or processing.

#### 3 types of queues

# Basic FIFO Queue

# LIFO Queue

# Priority Queue

from queue import Queue, LifoQueue

from threading import Thread, current_thread

from time import sleep

first_names = ['Steve','Jane','Sara','Mary','Jack','tara','bobby']

q = Queue() #FIFO

lq = LifoQueue() #LifoQueue

num_threads = 3

def do_stuff(q):

    while True:

        print(q.get(), current_thread())

        sleep(1)

        q.task_done()

if __name__ == '__main__':

    print('------ FIFO - Basic ------')

    for x in first_names:

        q.put(x)

    

    for i in range(num_threads):

        worker = Thread(target=do_stuff, args=(q,))

        worker.start()

    q.join()

    

    print('------ LIFO - reverse order -----')

    for x in first_names:

        lq.put(x)

    

    for i in range(num_threads):

        worker = Thread(target=do_stuff, args=(lq,))

        worker.start()

    lq.join()

Output:

------ FIFO - Basic ------

Steve <Thread(Thread-1, started 140202362271488)>

Jane <Thread(Thread-2, started 140202353878784)>

Sara <Thread(Thread-3, started 140202345486080)>

Mary <Thread(Thread-1, started 140202362271488)>

Jack <Thread(Thread-2, started 140202353878784)>

tara <Thread(Thread-3, started 140202345486080)>

bobby <Thread(Thread-1, started 140202362271488)>

------ LIFO - reverse order -----

bobby <Thread(Thread-4, started 140202337093376)>

tara <Thread(Thread-5, started 140202328700672)>

Jack <Thread(Thread-6, started 140202320307968)>

Mary <Thread(Thread-4, started 140202337093376)>

Sara <Thread(Thread-5, started 140202328700672)>

Jane <Thread(Thread-6, started 140202320307968)>

Steve <Thread(Thread-4, started 140202337093376)>