from multiprocessing import Pool
import time
import math

def sleep_function(x):
    return math.atan(x)+math.pi/2

def worker(x):
    time.sleep(sleep_function(x))
    print(x)

def tantime_sort(l):
    with Pool(len(l)) as p:
        p.map(worker, l)

TEST_CASE = [3, 21, 1000, 17, 69, -2, 1.0, 10000, 0.1]

tantime_sort(TEST_CASE)