How do I limit the number of active threads in python?

Question

Am new to python and making some headway with threading - am doing some music file conversion and want to be able to utilize the multiple cores on my machine (o

Answer 1

I would like to add something, just as a reference for others looking to do something similar, but who might have coded things different from the OP. This question was the first one I came across when searching and the chosen answer pointed me in the right direction. Just trying to give something back.

import threading
import time
maximumNumberOfThreads = 2
threadLimiter = threading.BoundedSemaphore(maximumNumberOfThreads)

def simulateThread(a,b):
    threadLimiter.acquire()
    try:
        #do some stuff
        c = a + b
        print('a + b = ',c)
        time.sleep(3)
    except NameError: # Or some other type of error
        # in case of exception, release
        print('some error')
        threadLimiter.release()
    finally:
        # if everything completes without error, release
        threadLimiter.release()
        
        
threads = []
sample = [1,2,3,4,5,6,7,8,9]
for i in range(len(sample)):
    thread = threading.Thread(target=(simulateThread),args=(sample[i],2))
    thread.daemon = True
    threads.append(thread)
    thread.start()
    
for thread in threads:
    thread.join()

This basically follows what you will find on this site: https://www.kite.com/python/docs/threading.BoundedSemaphore