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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
4
章 コードの再利用
you are here
165
変数名を
word
から
phrase
に変更しました。
汎用性のある便利な関数を作成する
前ページで話したように、変数名を
word
から
phrase
に変更した
search4vowels
関数を次に示します（
IDLE
で表示）。つまり、変数名は
word
からより適した
phrase
に
変更しています。
前ページでは、母音だけでなく任意の文字列を探すことができると便利になるとも言いました。これ
については、
phrase
から探す文字列を指定する第
2
引数を関数に追加するだけで可能です。この変更
は簡単です。しかし、この変更を行うと、この関数は母音ではなく任意の文字列を探すことになるので、
現在の関数名では適切ではありません。現在の関数は変更せずそのままにしておいて、元の関数をベー
スに新たな関数を作成しましょう。次のことを行います。
1
新しい関数に、より汎用的な名前を付ける。
search4vowels
に変更を加え続けることはせず、
search4letters
という新しい関数を
作成しましょう。この名前の方が新しい関数の目的を適切に表しています。
2
第
2
引数を追加する。
第
2
引数を追加すると、文字列から探し出す文字を指定できます。この第
2
引数を
letters
と
します。そして、忘れずに
letters
にアノテーションを付けるようにしましょう。
3
変数
vowels
を削除する。
母音ではなく、指定された文字を探すので、
vowels
という名前は適切ではありません。
4
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.