回答編集履歴
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このとき、
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```python
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# 方法1
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out = np.full((len(arr), arr.max()+1), '', dtype='U1')
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np.put_along_axis(out, arr, '1', 1)
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pd.DataFrame(out[:, 1:]).to_csv('data2.csv', header=None, index=None)
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# 方法2
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out = np.where((arr==np.arange(arr.max()+1)[:, None, None]).any(2).T, '1', '')
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pd.DataFrame(out[:, 1:]).to_csv('data2.csv', header=None, index=None)
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```
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```
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