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！
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63
データのどこを使う？
LESSON
06
データフレーム = データフレーム.concat([データフレーム, データフレーム])
dfA = pd.read_csv("test.csv", index_col=0)
dfB = pd.DataFrame()
dfB = pd.concat([dfB, dfA.iloc[[0]]])
dfB
列データや行データを削除する
不要な列データがあるときは、列を指定して削除することができます。「国語の列データを
削除」してみましょう（リスト
2.22）。
データフレーム = データフレーム.drop("列名", axis=1)
dfA = pd.read_csv("test.csv", index_col=0)
dfA = dfA.drop("
国語", axis=1)
dfA
※「axis=1」とは「列方向」を意味します。ここでは使いませんが「axis=0」は行方向を意味します。
書式：行データを追加する
【入力プログラム】リスト 2.21
出力結果
今度は、
A
太さんだけの
データフレームだね。
書式：列データを削除する
【入力プログラム】リスト 2.22
Chapter
2
64
不要な行データがあるときは、行を指定して削除することができます。「3行目の行データ
を削除」してみましょう ...
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