回答編集履歴
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Update
test
CHANGED
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@@ -12,7 +12,7 @@
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df = pd.read_csv(io.StringIO(data))
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#
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-
df['D'] = df.values.argmax(axis=1) + 1
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+
df['D'] = df[['A', 'B', 'C']].values.argmax(axis=1) + 1
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print(df)
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#
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