回答編集履歴
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サンプル修正
answer
CHANGED
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@@ -7,12 +7,15 @@
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```Python
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import pandas as pd
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df = pd.DataFrame({'sales':[5,10,15,20],
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'date':['20200401','20200401','20200402','20200403']})
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ret = df.groupby('date').agg({'sales':'sum'})
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print(ret)
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# sales
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#date
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#20200401 15
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#20200402 15
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#20200403 20
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```
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結果は date をIndexとした DataFrameで得られます
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