Threading

import time 
import threading

Without Multithreading

def calc_square(arr):
    print("calculate square numbers")
    for n in arr:
        time.sleep(1)
        print('square:',n*n)



def calc_cube(arr):
    print("calculate cube of numbers")
    for n in arr:
        time.sleep(1)
        print('cube:',n*n*n)

arr = [2,3,8,9]

t = time.time()

calc_square(arr)
calc_cube(arr)

print("done in : ",time.time()-t)

Output:-

calculate square numbers
square: 4
square: 9
square: 64
square: 81
calculate cube of numbers
cube: 8
cube: 27
cube: 512
cube: 729
done in :  8.093624591827393

With Multithreading

def calc_square(arr):
    print("calculate square numbers")
    for n in arr:
        time.sleep(1)
        print('square:',n*n)

def calc_cube(arr):
    print("calculate cube of numbers")
    for n in arr:
        time.sleep(1)
        print('cube:',n*n*n)

arr = [2,3,8,9]
t = time.time()
t1= threading.Thread(target=calc_square, args=(arr,))
t2= threading.Thread(target=calc_cube, args=(arr,))
t1.start()
t2.start()
t1.join()
t2.join()

print("done in : ",time.time()-t)

calculate square numberscalculate cube of numbers

square:cube: 8
 4
square:cube: 9
 27
cube: 512
square: 64
square:cube: 81
 729
done in :  4.0517966747283936