回答編集履歴
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修正
test
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@@ -2,7 +2,15 @@
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参考：[Python: pandas の DataFrameGroupBy#agg() には関数も渡せる](https://blog.amedama.jp/entry/2018/04/16/230703)
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単純な集計なら`.sum()`でよいです。
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```Python
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import pandas as pd
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from io import StringIO
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s = """A,B,C
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@@ -31,6 +39,26 @@
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#3 09031 20 30
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#4 09031 30 40
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dfg = df.groupby('A').sum()
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print(dfg)
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# B C
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#A
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#09011 20 10
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#09021 80 30
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#09031 50 70
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