The only sort algorithm you need

sleepsort.py

from threading import Thread
import time

a = [3, 1, 4]


def sleepsort(array):
    results = []
    threads = []
    def runner(x):
        time.sleep(x)
        results.append(x)

    for x in array:
        t = Thread(target=runner, args=(x,))
        t.start()
        threads.append(t)

    for t in threads:
        t.join()
    return results

print sleepsort(a)