Python - Oh Oh: Objects and Classes(decorator, property)

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 6(Oh Oh: Objects and Classes)、Things to Do 6.8.を解いてみる。

Things to Do 6.8.

コード(BBEdit)

sample8.py

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

class Element:
    def __init__(self, name, symbol, number):
        self.__name = name
        self.__symbol = symbol
        self.__number = number
    @property
    def name(self):
        return self.__name
    @property
    def symbol(self):
        return self.__symbol
    @property
    def number(self):
        return self.__number
    def __str__(self):
        return '{0} {1} {2}'.format(self.__name, self.__symbol, self.__number)
        

d = dict(name='Hydrogen', symbol='H', number=1)
hydrogen = Element(**d)
print(hydrogen.name, hydrogen.symbol, hydrogen.number)

try:
    hydrogen.name = 'hydrogen'
except Exception as err:
    print(err)
        

入出力結果(Terminal, IPython)

$ ./sample8.py
Hydrogen H 1
can't set attribute
$