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.
csv
から辞書に変換
TIME,DESTINATION
09:35,FREEPORT
17:00,FREEPORT
09:55,WEST END
19:00,WEST END
10:45,TREASURE CAY
12:00,TREASURE CAY
11:45,ROCK SOUND
17:55,ROCK SOUND
こちらの方が強力であることは間違いありません。
DictReader
関数
を
1
回呼び出すだけで、
csv
モジュールは生データを辞書のコレクション
に変換しています。
しかし、生データを次の要件に基づいて変換する場合を考えてみてくだ
さい。
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（最初の文字だけ大文字）に変換する。
これ自体は難しい作業ではありません。生データをリストのコレクショ
ンや辞書のコレクションとして考えると、簡単です。そこで、
for
ループを
書いてデータを
1
つの辞書に読み込み、その辞書を使ってあまり手をかけず
にこの変換を行えるようにしましょう。
480
12
章
CSV
データを辞書として読み込む
次は前ページの例に似ていますが、こちらは
csv.reader
ではなく
csv.
DictReader
を使います。
DictReader
は、
CSV
ファイルのデータを辞書と
して返します。各辞書のキーは
CSV
ファイルのヘッダ行から取得し、値は後続
の行から取ります。
キー
csv.DictReader
を使うように
する変更は簡単ですが、結果は
大きく異なります。前回は各行が ...
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.