September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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184
第 5 章 ステートメント
の派生型として定義します。
KeybordInterrupt
などの、一部の特殊な例外型は、
BaseException
から直接派生しています。
KeybordInterrupt
は、ターミナルでコントルールキー
+ C
キーの入力によって、キーボード割り
込みをかけられた時に、発生する例外です。
ま た、
sys.exit()
関数などが、プロセスを終了する時に送出する
SystemExit
例外も、
BaseException
から直接派生しています。
通常のアプリケーションでは、このような特殊な例外は捕捉せず、そのままプロセスを終了する
のが一般的です。
except
文では、捕捉する例外の省略や、
BaseException
型の指定は避け、特別
な理由のない限りは、
Exception
か、その派生形を指定するようにします。
try:
...
except: # NG:
例外型を指定しない
except
節は、全ての例外を捕捉してしまう。
...
try:
...
except BaseException: # NG:
キーボード割り込みなども捕捉してしまう
...
try:
...
except Exception: # OK:
アプリケーションやファイル操作などの例外のみ捕捉
...
5.5.2
raise
文
例外の送出は、
raise
文で行います。
raise
例外オブジェクト
例外オブジェクトには、送出する例外オブジェクト、または例外オブジェクトの型を指定しま
す。型を指定すると、自動的にその型のインスタンスを作成して送出します。 ...
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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.
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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.