September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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129
4.6 バイト列
に感じられます。
個人的には、変換する引数をいろいろな方法で指定できる
format()
メソッドが気に入っています
が、デバッグなどで手早く文字列を編集する場合は、気が付くと慣れ親しんだ
%
演算子で書式化し
てしまっていたりもします。
4.6
バイト列
バイト列は、画像や音楽データなど、バイナリデータのためのデータ型です。画像などのデータ
だけではなく、
ASCII
や
UTF-8
などでエンコードされたテキストデータをファイルから読み書き
する場合なども、バイト列を利用します。
バイト列オブジェクトは
0
〜
255
の整数値のシーケンスです。リストなどと同じように、イン
デックスやスライスでバイト列内の値を参照できます。バイト列オブジェクトは、更新不能なオブ
ジェクトで、オブジェクトを作成した時に指定した値は、後から変更できません。
バイト列リテラルは、要素となる文字をシングルクォーテーションマーク（
'
）やダブルクォー
テーションマーク（
"
）などで囲んだ文字列リテラルの先頭に、文字
b
か
B
を付加して記述しま
す。バイト列で使える文字は
ASCII
文字だけで、日本語などの文字は使えません。
b'spam' #
シングルクォーテーションマークのバイト列リテラル
b"spam" #
ダブルクォーテーションマークのバイト列リテラル
その他の点では、バイト列リテラルは文字列リテラルとほぼ同じで、
raw
文字列、リテラルの結
合など、同じように記述できます。エスケープシーケンスは、
\u
、
\U
、
\N
など、
Unicode
文字を ...
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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.