Benchmarker example: '+=' v.s. '=' & '+'

gistfile1.txt

# -*- coding: utf-8 -*-

##
## requires Benchmarker 3.0
##   http://pypi.python.org/pypi/Benchmarker/
##

from __future__ import with_statement

from benchmarker import Benchmarker, cmdopt
cmdopt.parse()
flag_all = cmdopt.get('all')

#loop = 100000
loop = 1000000

s = "SOS" * 10
with Benchmarker(width=25) as bm:
#for bm in Benchmarker(width=25, cycle=5, extra=1):

    with bm.empty():   ## empty loop
        pass

    with bm("x += s"):
        x = ""
        for i in xrange(loop):
            x += s

    with bm("x = x + s"):
        x = ""
        for i in xrange(loop):
            x = x + s

    with bm("x += s + '!'"):
        x = ""
        for i in xrange(loop):
            x += s + '!'

    if flag_all:
        with bm("x = x + s + '!'"):     ## VERY SLOW
            x = ""
            for i in xrange(loop):
                x = x + s + '!'

    with bm("x = x + (s + '!')"):
        x = ""
        for i in xrange(loop):
            x = x + (s + '!')


###
### output example
###
# $ py ex02.py [--all]
# ## benchmarker:       release 3.0.0 (for python)
# ## python platform:   darwin [GCC 4.2.1 (Apple Inc. build 5664)]
# ## python version:    2.7.1
# ## python executable: /usr/local/python/2.7.1/bin/python
#
# ##                            user       sys     total      real
# (Empty)                     0.0000    0.0000    0.0000    0.0000
# x += s                      0.3700    0.0500    0.4200    0.4227
# x = x + s                   0.3800    0.0600    0.4400    0.4319
# x += s + '!'                0.4800    0.0600    0.5400    0.5394
# x = x + (s + '!')           0.4800    0.0600    0.5400    0.5456
#
# ## Ranking                    real
# x += s                      0.4227 (100.0%) *************************
# x = x + s                   0.4319 ( 97.9%) ************************
# x += s + '!'                0.5394 ( 78.4%) ********************
# x = x + (s + '!')           0.5456 ( 77.5%) *******************
#
# ## Ratio Matrix               real    [01]    [02]    [03]    [04]
# [01] x += s                 0.4227  100.0%  102.2%  127.6%  129.1%
# [02] x = x + s              0.4319   97.9%  100.0%  124.9%  126.3%
# [03] x += s + '!'           0.5394   78.4%   80.1%  100.0%  101.2%
# [04] x = x + (s + '!')      0.5456   77.5%   79.2%   98.9%  100.0%