Python - Types and Operations(Tuples, Files, and Everything Else(nested structure(objects, boolean)))

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 3.4 (プログラミング言語)

Learning Python (Mark Lutz (著)、Oreilly & Associates Inc)のPART Ⅱ.(Types and Operations)、Chapter 9.(Tuples, Files, and Everything Else)、Test Your Knowledge: Quiz 6.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))

Test Your Knowledge: Quiz 6.

コード(BBEdit)

sample5.py

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

# 0, False, empty string, empty collection are False
for x in [0, False, '', [], {}, ()]:
    if x:
        print('{0} is True.'.format(x))
    else:
        print('{0} is False.'.format(x))

# other objects are True
for x in [10, True, 'python', [1], {'a':1}, (0,)]:
    if x:
        print('{0} is True.'.format(x))
    else:
        print('{0} is False.'.format(x))

入出力結果(Terminal, IPython)

$ ./sample6.py
0 is False.
False is False.
 is False.
[] is False.
{} is False.
() is False.
10 is True.
True is True.
python is True.
[1] is True.
{'a': 1} is True.
(0,) is True.
$