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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11
章 例外処理
うまくいかないときに
行うこと
this is a new chapter
413
このロープの
破壊試験を行ったよ。
何がいけないのかな。
コードがいかに優れていても、いつでも問題は生じます。
ここまでであなたは掲載された例をすべて実行できましたね？
今のところ、すべて問題な
く動作しているので、少し自信がついたと思います。しかし、コードは堅牢なのでしょう
か？
たぶん、違います。悪いことが起こらないという前提で書いたコードは、実はもろい
ものです。最悪の場合、予期せぬことが起こるので危険です。コードを書くときは、楽観的
よりも慎重になる方がずっとよいのです。予想どおりにコードを動作させ、そして失敗し
た際にうまく処理するには注意が必要です。この章では、起こりそうな問題だけでなく、問
題が発生したときに（そして、多くの場合はその前に）行うべきことも学びます。
問題点を探す
長い
エクササイズ
この章は、まず全体を眺めます。
vsearch4web.py
の最新コードを下に示します。ここでは、このコー
ドは
10
章の
check_logged_in
デコレータを使って
/viewlog
のユーザのアクセス制御をするよう
に変更しています。
時間をかけてこのコードを読み、本番環境で実行したときに問題が起こりそうな部分に鉛筆で丸印とコメ ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.