Python - 小さなツールの作成: 1つのことだけをうまくやる(ファイルの読み込み, 出力(built-in functions(open, print), with/as statement, string(find method, rstrip method)))

Programming Python
( O'Reilly Media)
Mark Lutz(著)

開発環境

• OS X Mavericks - Apple(OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python 3.4 (プログラミング言語)

Head First C ―頭とからだで覚えるCの基本(David Griffiths (著)、Dawn Griffiths (著) 中田 秀基(監訳)(翻訳)、木下 哲也 (翻訳)、オライリージャパン)の3章(小さなツールの作成: 1つのことだけをうまくやる)、自分で考えてみよう(p.139)をpythonで考えてみる。

自分で考えてみよう(p.139)

コード(BBEdit, Emacs)

sample139.py

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

with open('spooky.csv') as in_f, open('ufos.csv', 'w') as f1, \
     open('disappearances.csv', 'w') as f2, open('others.csv', 'w') as f3:
    for line in in_f:
        line = line.rstrip()
        if line.find('UFO') != -1:
            print(line, file=f1)
        elif line.find('Disappearance') != -1:
            print(line, file=f2)
        else:
            print(line, file=f3)

入出力結果(Terminal, IPython)

$ ./sample139.py
$ cat spooky.csv 
30.685163,-68.137207,Type=Yeti
-100.0, 50,Type=Test1
28.304380,-74.575195,Type=UFO
29.132971,-71.136475,Type=Ship
28.343065,-62.753906,Type=Elvis
27.868217,-68.005371,Type=Goatsucker
30.496017,-73.333740,Type=Disappearance
26.224447,-71.477051,Type=UFO
29.401320,-66.027832,Type=Ship
37.879536,-69.477539,Type=Elvis
22.705256,-68.192139,Type=Elvis
27.166695,-87.484131,Type=Elvis
50,200,Type=Test2
$ cat ufos.csv 
28.304380,-74.575195,Type=UFO
26.224447,-71.477051,Type=UFO
$ cat disappearances.csv 
30.496017,-73.333740,Type=Disappearance
$ cat others.csv 
30.685163,-68.137207,Type=Yeti
-100.0, 50,Type=Test1
29.132971,-71.136475,Type=Ship
28.343065,-62.753906,Type=Elvis
27.868217,-68.005371,Type=Goatsucker
29.401320,-66.027832,Type=Ship
37.879536,-69.477539,Type=Elvis
22.705256,-68.192139,Type=Elvis
27.166695,-87.484131,Type=Elvis
50,200,Type=Test2
$