回答編集履歴
1
結果を追加
test
CHANGED
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@@ -7,3 +7,19 @@
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7
7
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df.groupby(df.index.shift(-2,freq='m').year).sum()
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8
8
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9
9
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```
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10
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+
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11
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+
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12
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13
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+
**結果**
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14
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+
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15
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+
```
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16
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+
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17
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+
a b
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18
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19
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2010 10 30
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20
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+
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21
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2012 5 10
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22
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+
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23
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+
```
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24
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+
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25
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+
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