回答編集履歴
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サンプルの追加
test
CHANGED
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@@ -43,3 +43,29 @@
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などはどうでしょうか？
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---
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**【追加】**
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３．``DataFrame.where()`` を使う
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```Python
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import pandas as pd
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df = pd.DataFrame({'X':[1,2,0,4,5],'Y':[1,0,3,0,5]})
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df = df.where(df!=0, df.shift(1))
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```
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