Python - threading

import threading

def func(n):
    if n == 0 or n == 1:
        return n
    else:
        return func(n-1) + func(n-2)

def run_it(n):
    print(func(n))

all_threads = []

for n in range(10):
    t = threading.Thread(target=run_it, args=(n*4,))
    t.start()
    all_threads.append(t)

for t in all_threads:
    t.join()