Pythonで「確実に閉じる」コード | Codetter（こーどったー）

# Python3.x(3.1以上) Python2.x(2.7)
with open(load.txt) as loadfile, open(save.txt) as savefile:
    #ここに処理を書く
 
# Python3.x(3.0) とか Python2.x(2.6以下)
with open(load.txt) as loadfile:
    with open(save.txt) as savefile:
        #ここに処理を書く
 
#close()を持たないurlopenの戻り値なんかを閉じる場合
import contextlib
import urllib2
 
with contextlib.closing(urllib2.urlopen('http://www.python.org')) as fp:
    #ここに処理を書く