Finding Square and cube using Multi-threading

mul_threading.py

import threading
import time

arr =[2, 4, 6, 8, 9]

def calc_square(number):
    for n in number:
         num = n*n
         print('Square of ' + str(n) + ' is ' + str(num))
         #time.sleep(2)
    print('\n')

def calc_cube(number):
    for n in number:
        num = n*n*n
        print('Cube of ' + str(n) + ' is ' + str(num))
        #time.sleep(0.2)


t1 = threading.Thread(target= calc_square, args= (arr,))
t2 = threading.Thread(target= calc_cube, args= (arr,))

t1.start()
t2.start()

t1.join()
t2.join()