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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データの変換
484
12
章
データを必要なフォーマットに変換する
データを
flights
辞書に入れたので、バハマ・ブザー本社から求められてい
る操作について検討しましょう。
まずは
480
ページの
2
つの変換を実行し、その過程で新しい辞書を作成します。
1
フライト時刻を
24
時間表記から
AM/PM
表記に変換する。
2
目的地を大文字からタイトルケースに変換する。
上の
2
つの変換を
flights
辞書に適用すると、左側の辞書を右側の辞書に変換
できます。
フライト時刻を
24
時間表記から
AM/
PM
表記に変換して
います。
目的地を大文字
からタイトル
ケースに変更
しています。
どちらの辞書も意味は変わらず、表示方法だけが変更されています。本社は右
側の辞書を必要としています。右側のデータの方がわかりやすいと感じているか
らです。それに、すべて大文字で表記するのは強調したいときくらいだと思って
いるからです。
現在、両方の辞書のデータはフライト時刻と目的地の組み合わせごとに
1
行で
す。本社は左側の辞書を右側の辞書に変換すれば満足するでしょうが、目的地を
キーとし、フライト時刻のリストを値としてデータを表せたらとても便利そうで
す。つまり、目的地ごとに
1
行のデータにするのです。この変更を行うコードを書
く前に、変更後の辞書がどのような
ものなのかを確認してみましょう。
{'09:35': 'FREEPORT',
'09:55': 'WEST END',
'10:45': 'TREASURE CAY',
'11:45': 'ROCK ...
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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.