回答編集履歴
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Update
test
CHANGED
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@@ -9,7 +9,8 @@
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#
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idx = pd.DatetimeIndex(df['B'])
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columns = ['month', 'day', 'hour']
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df[columns] = pd.Series(idx.__getattribute__(i) for i in columns)
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print(df)
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#
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