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pandasで地味に使う書き方

Python
pandas

Last updated at 2020-05-13Posted at 2020-05-13

データフレームの並び替え

#デフォルトは昇順
newdf = df.sort_values(["column1","column2"])

#降順にするにはascending = Falseをつける
newdf = df.sort_values(["column1","column2"], ascending = [True, False])

欠損値の処理

#欠損値を0で埋めるケース
newdf = df.fillna(0)

#欠損値の列毎の集計方法
df.isnull().sum()

#欠損値の行だけ抽出
df[df.isnull() == True]

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