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データフレームのある列をインデックスに設定する df.set_index()

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ある列をインデックスに設定したい!
そんな時に、用いるのがset_index()です
df = df.set_index("インデックスに設定したいカラム名")

例えば、3列目くらいにageというカラムがあったとします。
年齢ごとにデータをまとめたいとき、一番左の列(インデックス列)にあればとてもデータとして
見やすいですよね。
是非使ってみてください!

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