September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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134
第 4 章 シーケンスとコンテナ型
4.6.4
バイト列のメソッド
バイト列オブジェクトには、以下のメソッドがあります。文字列オブジェクトとほぼ同じメソッ
ドを使えますが、一部のメソッドで引数などが異なっています。
バイト列オブジェクトは更新不能なオブジェクトで、メソッドなどを使っても、バイト列を変更
することはできません。メソッドにはバイト列の大文字を全て小文字に変換する
lower()
などが
ありますが、このようなメソッドでもバイト列オブジェクトの文字が変更されるのではなく、小文
字に変換したバイト列を値とする、新しいバイト列オブジェクトを戻り値として返します。
bytes.capitalize()
バイト列の最初の文字だけを大文字に、残りを小文字に変換した文字列を返します。
>>> b'sPaM'.capitalize() #
先頭だけを大文字に
Spam
bytes.center(width[,
fillchar
])
width
に指定したバイト数で中央揃えにしたバイト列を返します。バイト列の前後は、
fillchar
で指定した文字で補完します。
fillchar
省略時はスペースとなります。
パラメタ
width
−
全体のバイト数を指定します。
fillchar
−
余白を埋めるバイト列を指定します。
>>> b'spam'.center(10)
b' spam '
>>> b'spam'.center(10, b'-')
b'---spam---'
bytes.count(sub[,
start
[,
end ...
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