I've used joblib before and it does some nice things like make it easy to switch between different backends (loky, multiprocessing, threading) but recently I've started to use python's new-ish built-in way:

ThreadPoolExecutor if IO-bound

ProcessPoolExecutor if CPU-bound

for example

    from concurrent.futures import ThreadPoolExecutor

    with ThreadPoolExecutor(max_workers=4) as e:
        e.submit(shutil.copy, 'src1.txt', 'dest1.txt')
        e.submit(shutil.copy, 'src2.txt', 'dest2.txt')
    print("everything done!")