Running 1 Billion func in Python3 with joblib

billion.py

#pip3 install joblib first

from joblib import Parallel, delayed
import time


start_time = time.time()

def BillionFuncJob(key):
    time_of_running = time.time() - start_time
    print('Hello Parallel {} with duration in secs {:03.2f}'.format(key, time_of_running))
    pass

Parallel(n_jobs=-1)(delayed(BillionFuncJob)(key) for key in range(1000000000))