import numpy as np
import time
= time.time()
start_time = np.arange(1000000)
my_arr = list(range(1000000))
my_list = time.time()
start_time = my_arr * 2
my_arr2 print("--- %s seconds ---" % (time.time() - start_time))
= time.time()
start_time = [x * 2 for x in my_list]
my_list2 print("--- %s seconds ---" % (time.time() - start_time))
--- 0.01124119758605957 seconds ---
--- 0.037691593170166016 seconds ---