multiprocessing pool

test.py

from multiprocessing import Pool

class Test(object):
    def __init__(self):
        self.array = []

    def task(self, n):
        self.array.append(n)
        print(self.array)

    def run(self):
        p = Pool(4)
        p.map(self.task, [1, 2, 3, 4])

Test().run()