回答編集履歴
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@@ -1,8 +1,7 @@
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データがないのでバグがあるかもしれませんが。
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```python
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air_visit_df['g'] = air_visit_df['visit_date'].apply(lambda x: ''.join
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air_visit_df['g'] = air_visit_df['visit_date'].apply(lambda x: ''.join(x.split('-')[:2]))
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(x.split('-')[:2]))
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ans = air_visit_df[['visit_date' ,'g']].groupby('g').sum()
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```
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