回答編集履歴
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edit
test
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@@ -4,9 +4,7 @@
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```python
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7
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air_visit_df['g'] = air_visit_df['visit_date'].apply(lambda x: ''.join
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7
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air_visit_df['g'] = air_visit_df['visit_date'].apply(lambda x: ''.join(x.split('-')[:2]))
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-
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9
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(x.split('-')[:2]))
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9
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