Python - Object-Oriented Programming(class, __init__, __repr__, __str__)

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 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)

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 14(Object-Oriented Programming)、14.8(Exercises) 4.を解いてみる。

14.8(Exercises) 4.

コード(BBEdit)

sample4.py

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

class Nematode:
    def __init__(self, body_length, gender, age):
        self.body_length = body_length
        self.gender = gender
        self.age = age

    def __repr__(self):
        return 'Nematode(body_length = {0}, gender={1}, age={2})'.format(
            self.body_length, self.gender, self.age)

    def __str__(self):
        return 'Number\nbody length: {0}\ngender: {1}\nage:{2}'.format(
            self.body_length, self.gender, self.age)

if __name__ == '__main__':
    n1 = Nematode(1, 'hermaphrodite', 10)
    n2 = Nematode(1, 'male', 20)
    for nematode in (n1, n2):
        print(repr(nematode))
        print(nematode)

入出力結果(Terminal, IPython)

$ ./sample4.py
Nematode(body_length = 1, gender=hermaphrodite, age=10)
Number
body length: 1
gender: hermaphrodite
age:10
Nematode(body_length = 1, gender=male, age=20)
Number
body length: 1
gender: male
age:20
$