Python - Reading and Writing Files(open function(built-in function), with/as statement, mode(read/write))

Practical Programming
An Introduction to Computer Science
Using Python 3
(Pragmatic Programmers)
(Pragmatic Bookshelf)
Paul Gries (著) Jennifer Campbell (著)
Jason Montojo (著) Lynn Beighley (編集)

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)

Practical Programming: An Introduction to Computer Science Using Python 3 (Pragmatic Programmers) (Paul Gries (著)、Jennifer Campbell (著)、Jason Montojo (著)、Lynn Beighley (編集)、Pragmatic Bookshelf)のChapter 10(Reading and Writing Files)、10.10(Exercises) 1.を解いてみる。

10.10(Exercises) 1.

コード(BBEdit)

sample1.py

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

name = input('ファイル名: ')
with open(name) as in_f, open(name + '.bak', 'w') as out_f:
    for line in in_f:
        out_f.write(line)

入出力結果(Terminal, IPython)

$ ./sample1.py
ファイル名: sample1.py
$ cat sample1.py.bak
#!/usr/bin/env python3
#-*- coding: utf-8 -*-

name = input('ファイル名: ')
with open(name) as in_f, open(name + '.bak', 'w') as out_f:
    for line in in_f:
        out_f.write(line)

$