回答編集履歴
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追記
test
CHANGED
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@@ -25,3 +25,39 @@
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25
25
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return a
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```
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---
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33
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端的に言うと、次の挙動が原因です。
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34
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```Python
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>>> a = []
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39
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>>> b = []
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>>>
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>>> b.append(1)
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>>> a.append(b)
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>>>
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>>> b.append(2)
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>>> a.append(b)
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>>>
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>>> print(a)
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[[1, 2], [1, 2]]
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```
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Pythonで非常によく見る失敗例です。[Qiita - Python のリストの扱いで注意すること](https://qiita.com/utgwkk/items/5ad2527f19150ae33322)
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