August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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129
5.7 タグの選択
ノーベル賞受賞者と受賞者の
Wikipedia
ページへのリンクのリスト一覧が手に入ったので、こ
のリストを使って個々の人物情報ページからデータをスクレイピングします。これにはやや多くの
リクエストが必要になるので、何度も行いたくはありません。スクレイピングするデータをキャッ
シュし、
Wikipedia
に戻らずにさまざまなスクレイピングを試すことが、実用的で礼儀正しい方法
です
†
。
5.7.2
Web
ページのキャッシュ
Python
では簡単に高速なキャッシュ機能を構築できますが、ほとんどの場合は他の人がすでに
開発して親切にもオープンソースコミュニティに公開している優れたソリューションを探して利用
する方が簡単です。
requests
の
requests-cache
という素晴らしいプラグインは、数行の設定で基
本的なキャッシュニーズのすべてに対応します。
まず、
pip
を使ってこのプラグインをインストールします。
$ pip install --upgrade requests-cache
requests-cache
は、モンキーパッチ（
http://stackover?ow.com/questions/5626193/what-
is-a-monkey-patch
）を利用して実行時に
requests
API
の一部を動的に置き換えます。つまり、
requests-cache
は透過的に動作できるのです。キャッシュをインストールしてから
requests
を通
常どおりに使うだけで、すべてのキャッシュに対応してくれます ...
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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.