June 2024
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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！
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Chapter
2
44
名前 国語 数学 英語 学生番号
0A太 83 89 76 A001
1B
介 66 93 75 B001
2C
子 100 84 96 B002
3D
郎 60 73 40 A002
4E
美 92 62 84 C001
5F
菜 96 92 94 C002
インデックス
ヘッダー（項目名）
データフレームを作る
この表データをPythonで扱うには、「pandas（パンダス）」 というライブラリを使います。
表データを「データフレーム」に入れると、データの追加、削除、抽出、集計、書き出し
などを行うことができます。データフレームとは
pandasが用意するデータ形式で、Excelの
ように行と列でデータを管理できます。
データ操作の基本なので、しっかり使えるようになりましょう。
最初に「
import pandas as pd」と命令すると、pandasを「pd」という省略名で扱えるよ
うになり、「データフレーム
= pd.DataFrame(data)」などと指定して、データフレームを作
ります。
pandasでは、この行と列の2次元データを「データフレーム」として扱いますが、そこ
から
1列だけや1行だけを取り出して、1次元データとして扱うことができます。このデー
タは「シリーズ」と呼ばれます。「データフレーム（
2次元データ）」 から、「シリーズ（1次
元データ）」 を取り出して操作することで、データ分析や加工が柔軟に行えるのです。
まずは、「複数行のデータ」からデータフレームを作ってみましょう。
例えば、
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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.