回答編集履歴
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         @@ -1,3 +1,3 @@ 
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            ```python
         
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       2 
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            visitor[(i[0] - 2016) * 12 + (i[1] - 1)] += air_visit_df.ix[0]['visitors']
         
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            visitor[(int(i[0]) - 2016) * 12 + (int(i[1]) - 1)] += air_visit_df.ix[0]['visitors']
         
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       3 
3 
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            ```
         
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