March 2018
Beginner to intermediate
624 pages
16h 10m
Japanese
Content preview from Head First Python 第2版 ―頭とからだで覚えるPythonの基本
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例外処理
try
は
1
つだが、
except
はいくつも追加できる
別の例外から守るためには、単に
try
文に別の
except
ブロックを追加し、問題の
例外を特定して新しい
except
のブロックに必要と思われるコードを書きます。次は
（
PermissionError
例外が投げられた場合に）
PermissionError
例外を処理で
きるコードです。
('
データファイルがありません。
')
('
許可されていません。
')
許可されていません。
426
11
章
修正されたコードを実行しても、やはり
PermissionError
例外となりますが、修
正前と比べ、不快なトレースバックはずっとわかりやすいメッセージとなっています。
この部分は
FileNotFoundError
例外だけでなく
PermissionError
も
処理します。
except
ブロックは
何でも実行できます。
現在はそれぞれわかり
やすいメッセージを
表示しています。
ずっとよくなりました。
これはよさそうです。該当ファイルがない場合やアクセスできない（適切な権限を
持っていない）場合に対応できています。しかし、予想していなかった例外が投げられ
たらどうなるでしょうか？
さまざまな問題が起こる
前ページの最後に挙げた疑問（「予想していなかった例外が投げられたら？」）に答 ...
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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.
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.