Python - Py Boxes: Modules, Packages, and Programs(collections module,defaultdict class)

Introducing Python
Modern Computing in Simple Packages
(O'Reilly Media)
Bill Lubanovic (著)

開発環境

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

Introducing Python: Modern Computing in Simple Packages(Bill Lubanovic (著)、 O'Reilly Media)のChapter 5(Py Boxes: Modules, Packages, and Programs)、Things to Do 5.6.を解いてみる。

Things to Do 5.6.

コード(BBEdit)

sample7.py

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

import collections

dict_of_lists = collections.defaultdict(list)

dict_of_lists['a'].append('something for a')
print(dict_of_lists['a'])
print(dict_of_lists)

入出力結果(Terminal, IPython)

$ ./sample7.py
['something for a']
defaultdict(<class 'list'>, {'a': ['something for a']})
$