''' There is allways more than one way to solve a problem. Some are a little bit faster than others and some will slow down your program. Here are a few examples. Run this code on multiple devices and you will see very different results! ''' import time import random import operator count = 48000 print ('There is allways more than one way to solve a problem. Some are a little bit faster than others and some will slow down your program. Here are a few examples.\n') print ('Time in milliseconds') print('==================\n') print ('Add {} random numbers\n'.format(count)) starttime = (time.time()) sum = 0 for i in range (count): sum = sum + random.randint(0, 100) time1 = round(1000 * (time.time() - starttime)) starttime = (time.time()) sum = 0 for i in range (count): sum += random.randint(0, 100) time2 = round(1000 * (time.time() - starttime)) starttime = (time.time()) sum = 0 for i in range (count): operator.add(sum, random.randint(0, 100)) time3 = round(1000 * (time.time() - starttime)) print('{:<12}|{:<12}|{}'.format('b = b + x', 'b += x', 'operator.add()')) print('{:<12}|{:<12}|{}\n\n'.format(time1, time2, time3)) print ('Create a 2D array of size {} x {}\n'.format(int(count/100), int(count/100)) ) starttime = (time.time()) lst1 = [] lst2 = [] for i in range (int(count/100)): for j in range(int(count/100)): lst2.append(random.randint(1, 100)) lst1.append(lst2) lst2 = [] time1 = round(1000 * (time.time() - starttime)) starttime = (time.time()) lst3 = [[random.randint(1,100) for i in range (int(count/100))] for j in range (int(count/100))] time2 = round(1000 * (time.time() - starttime)) print('{:<12}|{}'.format('for-loop', 'list comp.')) print('{:<12}|{}\n\n'.format(time1, time2)) print('Fill a list with {} random numbers\n'.format(count)) starttime = (time.time()) lst4 = [] for i in range (count): lst4.append(random.randint(0,100)) time1 = round(1000 * (time.time() - starttime)) starttime = (time.time()) lst5 = [random.randint(0, 100) for i in range (count)] time2 = round(1000 * (time.time() - starttime)) print('{:<12}|{}'.format('for-loop', 'list comp.')) print('{:<12}|{}\n\n'.format(time1, time2)) print ('Filter odd numbers from a list of {} random numbers\n'.format(count)) starttime = (time.time()) filterlist = [] for i in lst4: if i % 2 != 0: filterlist.append(i) time1 = round(1000 * (time.time() - starttime)) starttime = (time.time()) filterlist = list(filter(lambda x: x % 2 != 0, lst4)) time2 = round(1000 * (time.time() - starttime)) print('{:<12}|{}'.format('for-loop', 'filter(lambda)')) print('{:<12}|{}\n\n'.format(time1, time2)) print ('Double all elements in a list of {} random numbers\n'.format(count)) starttime = (time.time()) doublelist = [] for i in lst4: doublelist.append (i *2) time1 = round(1000 * (time.time() - starttime)) starttime = (time.time()) doublelist = list(map(lambda x: x * 2, lst4)) time2 = round(1000 * (time.time() - starttime)) print('{:<12}|{}'.format('for-loop', 'map(lambda)')) print('{:<12}|{}\n\n'.format(time1, time2)) print ('Find all combinations of 6 letters\n'.format(count)) abc = ('a','b','c','d','e', 'f') starttime = (time.time()) perms = [] for a in abc: for b in abc: for c in abc: for d in abc: for e in abc: for f in abc: perms.append('{}{}{}{}{}{}'.format(a, b, c, d, e, f)) time1 = round(1000 * (time.time() - starttime)) starttime = (time.time()) perms = ['{}{}{}{}{}{}'.format(a, b, c, d, e, f) for a in abc for b in abc for c in abc for d in abc for e in abc for f in abc] time2 = round(1000 * (time.time() - starttime)) print('{:<12}|{}'.format('for-loop', 'list comp.')) print('{:<12}|{}'.format(time1, time2))

Python speed test