bench_string.py

import time

j = range(100000)


def test_plus():
    out = ''
    for i in j:
        out += 'a'
    return out


def test_format():
    out = ''
    for i in j:
        out = '{0}{1}'.format(out, 'a')
    return out


def test_modulo():
    out = ''
    for i in j:
        out = '%s%s' % (out, 'a')
    return out


def bench(fn):
    start = time.time()
    fn()
    print(time.time() - start)


bench(test_plus)
bench(test_format)
bench(test_modulo)

0.0101590156555
0.353223800659
0.328510046005

-----

0.0127718448639
0.34591794014
0.347246170044

-----

0.0113131999969
0.348247051239
0.337538003922

-----

0.012020111084
0.355268001556
0.343533992767

------

0.0097451210022
0.347717046738
0.357761144638