June 2025
Intermediate to advanced
356 pages
5h 13m
Japanese
Content preview from PythonによるWebスクレイピング 第3版Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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4章スクレイパーの開発
Webスクレイピングを始めると、ブラウザが行う細かいことすべてに感心するようになります。HTMLフォーマット、CSSでのスタイリング、JavaScriptの実行、画像レンダリングなどの機能がなかったとすれば、最初はとてもわかりにくいもののように思えるでしょう。この章ではWebブラウザの力を借りず、この剥き出しのデータをどのようにフォーマットし、解釈するかを見ていきます。
この章では、Webページから必要な情報を取り出すために、WebサーバーにGETリクエストを送信し、取得したページのHTMLを解析、必要な部分のみを抽出するといった基本から始めます。
4.1 Jupyterを使う
ここに掲載したコードはhttps://github.com/REMitchell/python-scrapingにあります。ほとんどのサンプルコードは、拡張子が.ipynbのJupyter Notebook形式となっています。
Jupyter Notebookは、互いに関連するPythonの小さなコード片を実行し、整理していくのに優れています（図4-1を参照）。
各コードは「セル」と呼ばれるボックスに入っています。各セル内のコードは、［Shift］＋［Enter］を入力するか、ページ上部にある実行ボタンをクリックすることで実行できます。
Project Jupyterは、2014年にIPython（Interactive Python）プロジェクトからスピンオフして始まりました。Jupyter Notebookは、Webブラウザ上でPythonのコードを実行するために設計されており、アクセスしやすくインタラクティブな環境を提供しています。そのため、教育やプレゼンテーションに適しています。 ...
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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.