Python - Functions and Generators(Timing tools)

Learning Python
(Oreilly & Associates Inc)
Mark Lutz (著)
(邦訳版)

開発環境

• OS X Mavericks - Apple(OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python (プログラミング言語)

Learning Python (Mark Lutz (著)、Oreilly & Associates Inc)のPART III.(Functions and Generators)、Test Your Knowledge: Part IV Exercises 、10.(Timing tools)を解いてみる。

その他参考書籍

• Pythonチュートリアル 第2版
• Python クックブック 第2版 (原書(最新版))

10.(Timing tools)

コード(BBEdit)

sample.py

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

import math
import sys
import timerseqs

l = list(range(10000))

def sqrtSqrt():
    for n in l:
        res = math.sqrt(n)
    return res

def sqrtOperator():
    for n in l:
        res = n ** 0.5
    return res

def sqrtPow():
    for n in l:
        res = pow(n, 0.5)
    return res

print(sys.version)
for test in (sqrtSqrt, sqrtOperator, sqrtPow):
    print('{0:12s}: {1:.5f} => {2}'.format(
        test.__name__, *timerseqs.bestoftotal(test)))

def dictComprehensions():
    return {x:x for x in l}

def dictForLoop():
    res = {}
    for x in l:
        res[x] = x
    return res

for test in (dictComprehensions, dictForLoop):
    print('{0:20}: {1:.5f}'.format(
        test.__name__, timerseqs.bestoftotal(test)[0]))

入出力結果(Terminal)

$ ./sample.py
3.3.5 (default, Mar 15 2014, 14:51:54) 
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.2.79)]
sqrtSqrt    : 3.30558 => 99.99499987499375
sqrtOperator: 3.45227 => 99.99499987499375
sqrtPow     : 5.06863 => 99.99499987499375
dictComprehensions  : 1.43393
dictForLoop         : 1.88521
$