Test progressbar2

#!/usr/bin/python
# -*- coding: utf-8 -*-

import datetime

from progressbar import ProgressBar

for n in range(1000, 1000001, 1000):
    a = 0
    a_start = datetime.datetime.now()
    for i in range(n):
        a += i
    a_end = datetime.datetime.now()

    b = 0
    b_start = datetime.datetime.now()
    with ProgressBar(max_value=n) as pb:
        for i in range(n):
            b += i
            pb.update(i)
    b_end = datetime.datetime.now()

    a_diff = (a_end - a_start).total_seconds()
    b_diff = (b_end - b_start).total_seconds()

    with open('results.csv', 'a+') as f:
        f.write('{},{},{},{}\n'.format(n, a_diff, b_diff, b_diff - a_diff))