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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85
4.5 Chrome のデベロッパーツール
4.4.7
データ
Web
可視化に必要なデータは、
Web
サーバから静的ファイル（
JSON
や
CSV
ファイルなど）と
して提供されるか、何らかの
Web API
（
RESTful API
（
https://ja.wikipedia.org/wiki/REST
）な
ど）で動的に提供されます。通常はサーバ側のデータベースからデータを取得します。この形式に
ついては第Ⅳ部で取り上げます。
かつては多くのデータが
XML
（
https://ja.wikipedia.org/wiki/Extensible_Markup_Language
）
形式で配信されていましたが、最近の
Web
可視化には主に
JSON
と、
JSON
ほどではないですが
CSV
や
TSV
ファイルも必要です。
JSON
（
https://ja.wikipedia.org/wiki/JavaScript_Object_Notation
）はデファクトの
Web
可視
化データの標準です。慣れておくとよいでしょう。
JSON
は当然
JavaScript
ととても相性がよく、
また、
Python
プログラマも
JSON
の構造には詳しいでしょう。「
3.5
JSON
」で説明したよう
に、
Python
では簡単に
JSON
データの読み書きができます。次に簡単な
JSON
データの例を示し
ます。
{
"firstName": "Groucho",
"lastName": "Marx",
"siblings": ["Harpo", "Chico", "Gummo", ...
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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.