str.endswith() と re.search() のベンチマーク

bench2.py

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

import sys, re
from benchmarker import Benchmarker

try:
    xrange
except:
    xrange = range


N = 100000
for bm in Benchmarker(width=30, cycle=10, extra=1):

    string = "foo-bar-baz.jpg"

    with bm.empty():
        for _ in xrange(N):
            pass

    with bm("re.search()"):
        for _ in xrange(N):
            re.search(r'\.(png|gif|jpg)', string)

    with bm("re.compile().search()"):
        rexp = re.compile(r'\.(png|gif|jpg)')
        for _ in xrange(N):
            rexp.search(string)

    with bm("str.endswith() #1"):
        for _ in xrange(N):
            string.endswith((".png", ".gif", ".jpg"))

    with bm("str.endswith() #2"):
        suffixes = (".png", ".gif", ".jpg")
        for _ in xrange(N):
            string.endswith(suffixes)


### Result example on CPython 3.4.1:
r"""
## Ranking                         real
str.endswith() #1                0.0412 (100.0%) *************************
str.endswith() #2                0.0450 ( 91.5%) ***********************
re.compile().search()            0.0818 ( 50.3%) *************
re.search()                      0.2867 ( 14.4%) ****

## Ratio Matrix                    real    [01]    [02]    [03]    [04]
[01] str.endswith() #1           0.0412  100.0%  109.3%  198.7%  696.2%
[02] str.endswith() #2           0.0450   91.5%  100.0%  181.8%  636.8%
[03] re.compile().search()       0.0818   50.3%   55.0%  100.0%  350.3%
[04] re.search()                 0.2867   14.4%   15.7%   28.5%  100.0%
"""