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トップPython 3.xに関する質問思ったようにprintされるのに、思ったようにappendされない。

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1

Fix answer that mistook intention of question

2020/06/27 18:59

投稿

y_shinoda
y_shinoda

スコア3272

test CHANGED
@@ -1,4 +1,14 @@
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- append ではなく [extend](https://docs.python.org/ja/3/tutorial/datastructures.html) を使いましょう:
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+ 変数 `c` に新しい list オブジェクトを生成して代入しなおしましょう。
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+
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+
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+
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+ これを行わないと、`c` は常に同じ list オブジェクトのまま編集され続け、
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+
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+ `d` の要素はすべて同じ list オブジェクトになってしまいます。
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+
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+
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+
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+ 修正の例:
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@@ -6,21 +16,21 @@
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  n=5
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- c=[0 for i in range(n)]
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-
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  d=[]
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  for i in range(1,2*n+1):
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- c[n-1]=i
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-
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  for j in range(1,2*n+1):
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+ c=[0 for i in range(n)]
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+
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+ c[n-1]=i
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+
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  c[n-2]=j
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  print(c)
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- d.extend(c)
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+ d.append(c)
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  print(d)
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@@ -236,12 +246,14 @@
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  [0, 0, 0, 10, 10]
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- [0, 0, 0, 1, 1, 0, 0, 0, 2, 1, 0, 0, 0, 3, 1, 0, 0, 0, 4, 1, 0, 0, 0, 5, 1, 0, 0, 0, 6, 1, 0, 0, 0, 7, 1, 0, 0, 0, 8, 1, 0, 0, 0, 9, 1, 0, 0, 0, 10, 1, 0, 0, 0, 1, 2, 0, 0, 0, 2, 2, 0, 0, 0, 3, 2, 0, 0, 0, 4, 2, 0, 0, 0, 5, 2, 0, 0, 0, 6, 2, 0, 0, 0, 7, 2, 0, 0, 0, 8, 2, 0, 0, 0, 9, 2, 0, 0, 0, 10, 2, 0, 0, 0, 1, 3, 0, 0, 0, 2, 3, 0, 0, 0, 3, 3, 0, 0, 0, 4, 3, 0, 0, 0, 5, 3, 0, 0, 0, 6, 3, 0, 0, 0, 7, 3, 0, 0, 0, 8, 3, 0, 0, 0, 9, 3,
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-
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- 0, 0, 0, 10, 3, 0, 0, 0, 1, 4, 0, 0, 0, 2, 4, 0, 0, 0, 3, 4, 0, 0, 0, 4, 4, 0, 0, 0, 5, 4, 0, 0, 0, 6, 4, 0, 0, 0, 7, 4, 0, 0, 0, 8, 4, 0, 0, 0, 9, 4, 0, 0, 0, 10, 4, 0, 0, 0, 1, 5, 0, 0, 0, 2, 5, 0, 0, 0, 3, 5, 0, 0, 0, 4, 5, 0, 0, 0, 5, 5, 0, 0, 0, 6, 5, 0, 0, 0, 7, 5, 0, 0, 0, 8, 5, 0, 0, 0, 9, 5, 0, 0, 0, 10, 5, 0, 0, 0, 1, 6, 0, 0, 0, 2, 6, 0, 0, 0, 3, 6, 0, 0, 0, 4, 6, 0, 0, 0, 5, 6, 0, 0, 0, 6, 6, 0, 0, 0, 7, 6, 0, 0, 0, 8, 6,
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-
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- 0, 0, 0, 9, 6, 0, 0, 0, 10, 6, 0, 0, 0, 1, 7, 0, 0, 0, 2, 7, 0, 0, 0, 3, 7, 0, 0, 0, 4, 7, 0, 0, 0, 5, 7, 0, 0, 0, 6, 7, 0, 0, 0, 7, 7, 0, 0, 0, 8, 7, 0, 0, 0, 9, 7, 0, 0, 0, 10, 7, 0, 0, 0, 1, 8, 0, 0, 0, 2, 8, 0, 0, 0, 3, 8, 0, 0, 0, 4, 8, 0, 0, 0, 5, 8, 0, 0, 0, 6, 8, 0, 0, 0, 7, 8, 0, 0, 0, 8, 8, 0, 0, 0, 9, 8, 0, 0, 0, 10, 8, 0, 0, 0, 1, 9, 0, 0, 0, 2, 9, 0, 0, 0, 3, 9, 0, 0, 0, 4, 9, 0, 0, 0, 5, 9, 0, 0, 0, 6, 9, 0, 0, 0, 7, 9,
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-
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- 0, 0, 0, 8, 9, 0, 0, 0, 9, 9, 0, 0, 0, 10, 9, 0, 0, 0, 1, 10, 0, 0, 0, 2, 10, 0, 0, 0, 3, 10, 0, 0, 0, 4, 10, 0, 0, 0, 5, 10, 0, 0, 0, 6, 10, 0, 0, 0, 7, 10, 0, 0, 0, 8, 10, 0, 0, 0, 9, 10, 0, 0, 0, 10, 10]
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+ [[0, 0, 0, 1, 1], [0, 0, 0, 2, 1], [0, 0, 0, 3, 1], [0, 0, 0, 4, 1], [0, 0, 0, 5, 1], [0, 0, 0, 6, 1], [0, 0, 0, 7, 1], [0, 0, 0, 8, 1], [0, 0, 0, 9, 1], [0, 0, 0, 10, 1], [0, 0, 0, 1, 2], [0, 0, 0, 2, 2], [0, 0, 0, 3,
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+
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+ 2], [0, 0, 0, 4, 2], [0, 0, 0, 5, 2], [0, 0, 0, 6, 2], [0, 0, 0, 7, 2], [0, 0, 0, 8, 2], [0, 0, 0, 9, 2], [0, 0, 0, 10, 2], [0, 0, 0, 1, 3], [0, 0, 0, 2, 3], [0, 0, 0, 3, 3], [0, 0, 0, 4, 3], [0, 0, 0, 5, 3], [0, 0, 0,
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+
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+ 6, 3], [0, 0, 0, 7, 3], [0, 0, 0, 8, 3], [0, 0, 0, 9, 3], [0, 0, 0, 10, 3], [0, 0, 0, 1, 4], [0, 0, 0, 2, 4], [0, 0, 0, 3, 4], [0, 0, 0, 4, 4], [0, 0, 0, 5, 4], [0, 0, 0, 6, 4], [0, 0, 0, 7, 4], [0, 0, 0, 8, 4], [0, 0,
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+
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+ 0, 9, 4], [0, 0, 0, 10, 4], [0, 0, 0, 1, 5], [0, 0, 0, 2, 5], [0, 0, 0, 3, 5], [0, 0, 0, 4, 5], [0, 0, 0, 5, 5], [0, 0, 0, 6, 5], [0, 0, 0, 7, 5], [0, 0, 0, 8, 5], [0, 0, 0, 9, 5], [0, 0, 0, 10, 5], [0, 0, 0, 1, 6], [0, 0, 0, 2, 6], [0, 0, 0, 3, 6], [0, 0, 0, 4, 6], [0, 0, 0, 5, 6], [0, 0, 0, 6, 6], [0, 0, 0, 7, 6], [0, 0, 0, 8, 6], [0, 0, 0, 9, 6], [0, 0, 0, 10, 6], [0, 0, 0, 1, 7], [0, 0, 0, 2, 7], [0, 0, 0, 3, 7], [0, 0, 0, 4, 7],
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+
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+ [0, 0, 0, 5, 7], [0, 0, 0, 6, 7], [0, 0, 0, 7, 7], [0, 0, 0, 8, 7], [0, 0, 0, 9, 7], [0, 0, 0, 10, 7], [0, 0, 0, 1, 8], [0, 0, 0, 2, 8], [0, 0, 0, 3, 8], [0, 0, 0, 4, 8], [0, 0, 0, 5, 8], [0, 0, 0, 6, 8], [0, 0, 0, 7, 8], [0, 0, 0, 8, 8], [0, 0, 0, 9, 8], [0, 0, 0, 10, 8], [0, 0, 0, 1, 9], [0, 0, 0, 2, 9], [0, 0, 0, 3, 9], [0, 0, 0, 4, 9], [0, 0, 0, 5, 9], [0, 0, 0, 6, 9], [0, 0, 0, 7, 9], [0, 0, 0, 8, 9], [0, 0, 0, 9, 9], [0, 0, 0, 10, 9], [0, 0, 0, 1, 10], [0, 0, 0, 2, 10], [0, 0, 0, 3, 10], [0, 0, 0, 4, 10], [0, 0, 0, 5, 10], [0, 0, 0, 6, 10], [0, 0, 0, 7, 10], [0, 0, 0, 8, 10], [0, 0, 0, 9, 10], [0, 0, 0, 10, 10]]
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  ```