回答編集履歴
1
applyを使う方法を追加
answer
CHANGED
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@@ -16,4 +16,19 @@
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16
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1 2 aBc
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2 3 zzA
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3 4 abZ
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19
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```
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applyを使うとこうです。
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```python
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>>> import pandas
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>>> import numpy as np
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>>> path = pd.DataFrame({'A':[1,2,3,4], 'path1': ['Abc', 'aBc', 'zzA', 'abZ']})
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>>> path['path1'] = path['path1'].apply(lambda x: x if x[0] != 'A' else np.nan)
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>>> print(path)
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A path1
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0 1 NaN
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1 2 aBc
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2 3 zzA
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3 4 abZ
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19
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```
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