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.
12
章
高度なイテレーション
猛烈にループする
ループはとにかく時間がかかります。
ほとんどのループは何かを何回も実行するためのものなので、当然のこととも言え
ます。ループを最適化するには、
2
つの方法があります。
1.
構文の改善（ループの
指定を容易にする）と
2.
実行方法の改善（ループを高速にする）です。はるか昔、
Python 2
の初期に、言語設計者はこの両方を実現するような言語機能、内包表記
を追加しました。この奇妙な名前を聞いただけでうんざりしたかもしれませんが、
この章を読み終わる頃までには、今までずっと内包表記なしで済ませてきたことに
驚くほど、内包表記の素晴らしさがわかるでしょう。
CSV
データをリストとして読み込む
............................................ 479
CSV
データを辞書として読み込む
................................................ 480
生データの中の不要な文字を除去してから分割
.......................... 482
メソッド呼び出しをつなげるときには注意する
.......................... 483
データを必要なフォーマットに変換する
..................................... 484
リストの辞書に変換する
............................................................... ...
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.