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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改行はいらない
生データの中の不要な文字を除去してから分割
前述の
with
文では、（すべての文字列オブジェクトに含まれる）
split
メソッド
を使って生データの行を
2
つに分割しました。返されたリストの文字列の要素を変
数
k
と
v
に代入します。この複数の変数の代入が可能なのは、代入演算子の左辺に変
数のタプルがあり、代入演算子の右辺にリストを作成するコードがあるからです（タ
プルは不変リストでしたね）。
...
k, v = line.split(',')
...
別の文字列メソッド
strip
は、文字列の先頭と末尾のホワイトスペースを取り除
きます。
split
を実行する前に、
strip
メソッドを使って生データから不要な末尾
の改行を取り除きましょう。
次は、データを読み込むコードの最終的なバージョンです。辞書
flights
を作成
し、キーにフライト時刻を、値に目的地（改行は含まれない）を使
います。
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
482
12
章
変数のリストを
作成します。
変数のタプル
ホワイトスペース：文字列
内の空白、
\t
、
\n
、
\r
はホ
ワイトスペースとみなされ
ます。
行中のホワイトスペースを
取り除いてから分割し、
要件に合うフォーマットの
データを作成します。
気付いていないかもしれま ...
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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.