回答編集履歴
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別解を追記
test
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@@ -47,3 +47,57 @@
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> これ以上列数が長かったらループかな。。
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---
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**【追記】**
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よくよく考えたら、もう少しスマートな方法があった・・・
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```Python
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import io
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import pandas as pd
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data = """
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A,3,3,1
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B,0,3,1
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C,1,0,1
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D,1,0,1
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"""
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df = pd.read_csv(io.StringIO(data), header=None, index_col=0)
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df = df.apply(lambda d: d.cumsum(), axis=1)
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# 1 2 3
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#0
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#A 3 6 7
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#B 0 3 4
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#C 1 1 2
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#D 1 1 2
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```
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