質問編集履歴
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### 以下のようなテーブルを年度をカラムにした形で整形したい
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### 解決策
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```python
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import pandas as pd
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df = pd.DataFrame({'YMD':[2012,2012,2013,2014,2014],
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'ITEM_CD':['0001','0002','0003','0001','0003'],
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'SALES':[100,200,300,200,400]})
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# MultiIndex の解除
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df2 = df.reset_index(drop=False)
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# NaN を 0 で置換
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df2.pivot(index='ITEM_CD', columns='YMD', values='SALES').fillna(0)
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```
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| 0002 | 200 | 0 | 0 |
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| 0003 | 0 | 300 | 400 |
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| 0003 | 0 | 300 | 400 |l
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MultiIndex から Index と 行 に分ける方法について
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MultiIndex から Index と 行 に分ける方法について (行列置換)
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MultiIndex から Index と 行 に分ける方法について
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##### (現状)
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- `YMD` と `ITEM_CD` で MultiIndex を設定している状態
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| :---: | :---: | :---: |
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| YMD | ITEM_CD | |
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| | | SALES |
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| **YMD** | **ITEM_CD** | |
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| 201
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| 2012 | 0001 | 100 |
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| | 0002 | 200 |
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| 2013 | 0003 | 300 |
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| 2014 | 0001 | 200 |
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| | 0003 | 400 |
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| | 0003 | 400 |
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##### (理想)
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- `ITEM_CD` を Index に設定
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| | 2012 | 2013 | 2014 |
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| | 2012 | 2013 | 2014 |
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| :---: | :---: | :---: | :---: |
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| **ITEM_CD** | | | |
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| 000
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| 0001 | 100 | 0 | 400 |
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| 0002 | 200 | 0 | 0 |
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| 0003 | 0 | 300 | 400 |
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| 0003 | 0 | 300 | 400 |
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