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
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,
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.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.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.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.
184
8 章 pandas 入門
8.5.1
JSON
pandas
では本書で推奨する
JSON
フォーマットから簡単にデータを読み込むことができます。
df = pd.read_json('file.json')
JSON
ファイルは、
orient
引数に
split
、
records
、
index
、
columns
、
values
のいずれかを指定
することでさまざまな形式をとることができます。本書の標準は
records
で、次のような形式です。
[{"name":"Albert Einstein", "category":"Physics", ...},
{"name":"Marie Curie", "category":"Chemistry", ... } ... ]
JSON
オブジェクトのデフォルトは
colums
で、次の形式です。
{"name":{"0":"Albert Einstein","1":"Marie Curie" ... },
"category":{"1","Physics","2":"Chemistry" ... }}
前にも述べたように、
Web
ベースの可視化作業（特に
D3
）では、行
/
列形式データをブラウザ
に渡すには、
records
形式の
JSON
が最も一般的です。
一般に
read_json
メソッドと Python の JSON パーサは厳密で、例外が期待するほど役に立たない
ので、pandas で作業するには有効な JSON ファイルが必要です
†
。JSON エラーで一般的なのは、
キーを二重引用符記号で囲んでいない場合や二重引用符であるべきところに単一引用符になっている ...
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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.