質問編集履歴
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pandas で
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pandas で YYYY-03-01 から (YYYY+1)-02-29 を YYYY 年度としてまとめたい
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#
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### 例
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- 2010-03-01 から 2011-02-29
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##
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#### (理想)
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| | a | b |
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| :---: | :---: | :---: |
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| 2010 | 8 | 23 |
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| 2011 | 15 | 30 |
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#### 元データ
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|2010-03-01|1|6|
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|2010-06-30|2|7|
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|2010-10-30|3|8|
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|2011-02-29|4|9|
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|2012-06-30|5|10|
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| ymd | a | b |
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| :-- | :--: | --: |
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| 2010-03-01 | 1 | 6 |
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| 2011-01-02 | 3 | 8 |
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| 2011-02-29 | 4 | 9 |
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| 2012-04-30 | 5 | 10 |
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| 2012-07-20 | 5 | 10 |
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# 2010年度のaは
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| 2010 | 10 |
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| 2013-02-20 | 5 | 10 |
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| 2011 | xx |
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...
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```
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test
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df.groupby(df.index.year).sum()
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```
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## 直接指定すれば解決できる
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- 自動化？したい
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```python
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df['2010-03':'2011-02'].sum()
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```
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- 2010-03-01 から 2011-02-29
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- 2010年度
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## hoge.csv
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```python
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df = pd.read_csv("hoge.csv", parse_dates=['ymd'],index_col=0)
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df.groupby().sum()
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```
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## 年別は以下で可能
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- `YYYY0101` から `YYYY1231` の区間で集計している？
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```python
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df.groupby(df.index.year).sum()
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```
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