回答編集履歴
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answer
CHANGED
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@@ -15,4 +15,16 @@
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print(df["A"].columns)
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# AttributeError: 'Series' object has no attribute 'columns'
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```
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DataFrame の列をリストで取得したい場合は以下のようにすればよいです。
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```python
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import pandas as pd
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df = pd.DataFrame({"A": [1, 2, 3],
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"B": [4, 5, 6],
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"C": [7, 8, 9]})
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print(df.columns.tolist()) # ['A', 'B', 'C']
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```
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