回答編集履歴
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Update
test
CHANGED
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@@ -1,24 +1,21 @@
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```python
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import pandas as pd
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df = pd.DataFrame(
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df = pd.DataFrame(data={
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'A': ['1_あいうえお 2_かきく 3_さしすせそ 2_かきくけこ',
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'1_あいうえお 2_かきく 3_さしすせそ 2_かきくけこ 3_さしす']
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)
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})
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#
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def update_to_latest(s):
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s = s.dropna()
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df['B'] = df['A'].str.split(r'\s+', expand=True)\
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.apply(lambda x: x.groupby(x.str.extract(r'^(\d+_)')[0])
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.apply(lambda x: pd.Series(x.iloc[-1], index=x.index[:1]) if x.name == last else x)\
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.s
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.last().str.cat(sep=' '), axis=1)
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df['B'] = df['A'].str.split(r'\s+', expand=True).apply(update_to_latest, axis=1)
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print(df)
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```
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| | A | B
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| | A | B |
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|---:|:---------------------------------------------------------|:---------------------------------------
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|---:|:---------------------------------------------------------|:---------------------------------------|
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| 0 | 1_あいうえお 2_かきく 3_さしすせそ 2_かきくけこ | 1_あいうえお 2_かきくけこ 3_さしすせそ
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| 0 | 1_あいうえお 2_かきく 3_さしすせそ 2_かきくけこ | 1_あいうえお 2_かきくけこ 3_さしすせそ |
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| 1 | 1_あいうえお 2_かきく 3_さしすせそ 2_かきくけこ 3_さしす | 1_あいうえお 2_かきく 3_さしす
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| 1 | 1_あいうえお 2_かきく 3_さしすせそ 2_かきくけこ 3_さしす | 1_あいうえお 2_かきくけこ 3_さしす |
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