How do I parallelize a simple Python loop?

Question

This is probably a trivial question, but how do I parallelize the following loop in python?

# setup output lists
output1 = list()
output2 = list()
output3 =          


        

Answer 1

from joblib import Parallel, delayed
import multiprocessing

inputs = range(10) 
def processInput(i):
    return i * i

num_cores = multiprocessing.cpu_count()

results = Parallel(n_jobs=num_cores)(delayed(processInput)(i) for i in inputs)
print(results)

The above works beautifully on my machine (Ubuntu, package joblib was pre-installed, but can be installed via pip install joblib).

Taken from https://blog.dominodatalab.com/simple-parallelization/