June 2024
Intermediate to advanced
200 pages
4h 46m
Japanese
Content preview from Python2年生 データ分析のしくみ 第2版 体験してわかる！会話でまなべる！
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,
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.
Chapter
2
50
以下のようなテキストファイルを作ってください（10ページのダウンロードサイトからサ
ンプルファイルをダウンロードして用意することもできます）。
名前,国語,数学,英語,学生番号
A太,83,89,76,A001
B
介,66,93,75,B001
C
子,100,84,96,B002
D
郎,60,73,40,A002
E
美,92,62,84,C001
F
菜,96,92,94,C002
名前,国語,数学,英語,学生番号
A太,83,89,76,A001
B介,66,93,75,B001
C子,100,84,96,B002
D郎,60,73,40,A002
E美,92,62,84,C001
F菜,96,92,94,C002
ヘッダー
行（
1件のデータ）
CSVファイル
※ は折り返し記号です。
ファイルのデータ形式に注意しよう
このとき注意することがあります。一般的なCSVファイルは、「それぞれの作者によって
データ形式が違う」ので、あらかじめ「どんなデータ形式なのかを調べて」その形式に合っ
た読み込み方を行う必要があります。
日本語のデータの場合、「
UTF-8形式」か「Shift-JIS形式」かを調べます。ファイル形式が
UTF-8形式の場合は、「pd.read_csv("ファイル名.csv")」という命令を使います（リスト2.5）。
DataFrame = pd.read_csv("ファイル名.csv")
【サンプルファイル】（test.csv）
ヘッダーのある
CSV
データだね！
書式：CSV ファイル（UTF-8 ...
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.