March 2018
Beginner to intermediate
624 pages
16h 10m
Japanese
Content preview from Head First Python 第2版 ―頭とからだで覚えるPythonの基本
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テスト、テスト、テスト
9.
テストするまで終わらない
この本では、（
4
章の最後で）
PEP 8
準拠を調べるための
py.test
ツールを少し紹介した以外は自動
テストにはほとんど触れていません。これは自動テストを軽視しているわけではありません。自動テ
ストはとても重要だと考えています。自動テストだけで
1
冊の書籍にしてもよいほど重要なトピック
です。
それにもかかわらず、この本では意図的に自動テストツールを使いませんでした。理由
は、自動テストを軽視しているわけではなく、実際にはとても重要だと考えているのです
が、新しく学ぶプログラミング言語で自動テストを使うと、かえって混乱してしまうと考
えたからです。テストの作成はテスト対象をよく理解していることが前提です。それなの
に、初めての慣れない言語でテストすることになったとしたら、結果はだいたい想像でき
ますよね？
これは鶏が先か卵が先かということに少し似ています。プログラミングの学習
とテスト方法
の学習のどちらを先にすべきでしょうか？
もちろん、あなたはもう本物の
Python
プログラマなので、
Python
の標準ライブラリでテストがどの
ように簡単かを理解できるでしょう。テスト用の優れたモジュールが
2
つあります。
●
doctest
：テストをモジュールの
docstring
に埋め込むことができます。これは思ったほど奇妙
ではなく、とても便利です。
●
unittest
：別の言語ですでに
unittest
ライブラリを使ったことがあるかもしれませんが、
Python ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.