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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もうゼロはいらない
辞書はどれくらい動的なのか？
vowels4.py
は、母音の出現回数が
0
回のときでもすべての母音を表示します。これで困ることはな
いかもしれませんが、実際にその母音が含まれるときだけ結果を表示させたいとします。つまり、「出現
回数は
0
回」というメッセージは見たくないのです。
この問題を解決するにはどうしますか？
うまくいきそうな気がします。
現在は、
vowels4.py
の冒頭に最初に母音の頻度を
0
に設定する
5
行のコードがあります。このコードは、
たとえ使われないものがあっても各母音に対応する
キーと値のペアを作成します。この
5
行を削除し、出現
する母音の回数だけを記録して残りは無視するように
すべきです。
このアイデアを試してみましょう。
114
3
章
Python
の辞書は動的だよね。それなら、
母音の出現回数を初期化する
5
行を削除する
だけでいいんじゃないの？この行がなければ、
含まれる母音だけをカウントするよね？
vowels4.py
を
vowels5.py
として保存します。そして、
5
行
の 初 期 化 コ ー ド を 削 除 し ま す。
IDLE
の 編 集 ウ ィ ン ド ウ は こ の
ページの右側のようになっている
でしょう。
初期化コードを削除した
vowels5.py
辞書のキーは初 ...
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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.