September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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54
第 3 章 式とデータ型
アン、
'little'
ならばリトルエンディアンとなります。実行中のシステムのエンディアンは、
sys
モジュールの
sys.byteorder
で取得できます。
signed
−
負数を
2
の補数で出力するかどうかを指定します。
signed
は
キーワード専用引数で、
必ず
signed = True
の形式で指定します。
バイト列から、整数型のオブジェクトに変換します。整数値のバイト列は、
int.to_bytes()
メ
ソッドなどで作成できます。
>>> int.from_bytes(b'\x00\xff', byteorder='big')
255
signed=True
とすると、バイト列は
2
の補数による符号付き整数として変換されます。
>>> int.from_bytes(b'\xfe\xff\xff\xff', byteorder='little', signed=True)
-2
3.10.2
整数のメソッド
整数型オブジェクトには、次のメソッドがあります。
int.to_bytes(
length
,
byteorder
,
*
,
signed=False
)
整数値のバイト列を取得します。
パラメタ
length
−
出力バイト列の長さを指定します。
byteorder
−
出力バイト列のエンディアンを、文字列で指定します。
'big'
ならばビッグエン
ディアン、
'little'
ならばリトルエンディアンとなります。実行中のシステムのエンディア
ンは、
sys
モジュールの
sys.byteorder ...
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