multithread python3

import timeimport threadingdef calc_square(number):   print("Calculate square numbers: ")   for i in numbers:      time.sleep(0.2)   #artificial time-delay      print('square: ', str(n*n))def calc_cude(number):   print("Calculate cude numbers: ")   for i in numbers:      time.sleep(0.2)      print('cube: ', str(n*n*n))arr = [2,3,8,9]t = time.time()t1 = threading.Thread(target = cal_square,args=(arr,))t2 = threading.Thread(target = cal_cube,args=(arr,))# creating two threads here t1 & t2t1.start()t2.start()# starting threads here parallelly by usign start function.t1.join()# this join() will wait until the cal_square() function is finised.t2.join()# this join() will wait unit the cal_cube() function is finised.print("Successed!")