September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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299
8.3 イントロスペクション
os.fsencode(
filename
)
文字列
filename
を、デフォルトのエンコーディング（
sys.getfilesystemencoding()
）でエン
コードします。このとき、エラーハンドラに
Windows
では
strict
エラーハンドラ、それ以外で
は
surrogateescape
エラーハンドラを指定します。
filename
がバイト列の場合、変換せずにその
まま返します。
os.fsdecode(
filename
)
バイト列
filename
を、デフォルトのエンコーディング（
sys.getfilesystemencoding()
）でデ
コードします。このとき、エラーハンドラに
Windows
では
strict
エラーハンドラ、それ以外で
は
surrogateescape
エラーハンドラを指定してデコードします。
filename
が文字列の場合、変換
せずにそのまま返します。
8.3
イントロスペクション
Python
は動的なプログラミング言語なので、関数を呼び出したり、オブジェクトの属性を参照
したとき、その値がいったいどのようなオブジェクトなのか、不明な場合があります。ドキュメン
トを参照して解決できれば良いですが、ドキュメントには書かれていないような、処理内部の情報
を知る必要があったり、ドキュメントが十分に整備されておらず、情報が不足していることも珍し
くありません。
Python
には、このようなときに処理を実際に動かしながらオブジェクトを調べる手段が、いろ
いろ用意されています。そのように、オブジェクトを調査することを ...
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