回答編集履歴
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結果を追加
answer
CHANGED
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@@ -2,4 +2,11 @@
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2
2
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3
3
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```Python
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4
4
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df.groupby(df.index.shift(-2,freq='m').year).sum()
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5
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-
```
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5
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+
```
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6
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+
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7
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+
**結果**
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8
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+
```
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9
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a b
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10
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+
2010 10 30
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11
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2012 5 10
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12
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+
```
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