November 2025
Intermediate to advanced
984 pages
16h 17m
Japanese
Content preview from Fluent Python 第2版 ―Pythonicな思考とコーディング手法
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10章第1級関数のデザインパターン
パターンに従ってさえいればよいというものでもありません。
—— Ralph Johnson
古典的名著『Design Patterns』の共著者†1
[†1] IME/CCSLでのRalph Johnsonによる講演『Root Cause Analysis of Some Faults in Design Patterns』のスライドより。Universidade de São Paulo、2014年11月15日
ソフトウェア工学の業界では、ソフトウェアデザインパターン（https://fpy.li/10-1）とはよくあるデザイン上の課題を解決するための一般的なレシピを意味します。この章では、それぞれのデザインパターンについての知識は前提としていません。コード例に出てくるパターンは、必要に応じて解説していきます。
プログラミングの世界でデザインパターンの利用が広まったのは、通称Gang of Fourと呼ばれるErich Gamma、Richard Helm、Ralph Johnson、John Vlissidesの4人組による記念碑的書籍『Design Patterns: Elements of Reusable Object-Oriented Software』（Addison-Wesley）がきっかけです。この本にはクラスの配置に関するパターンが23種掲載されています。コードはC++で記述されていますが、他のオブジェクト指向言語にも適用できます。
デザインパターンは言語に依存しませんが、すべてのパターンがすべての言語で利用できるとは限りません。例えば「17章 イテレータ、ジェネレータ、従来のコルーチン」では、Iteratorパターン（
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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.