回答編集履歴
3
表現の修正
answer
CHANGED
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@@ -7,8 +7,8 @@
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7
7
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**勘違いしていそうな点**
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8
8
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range(x, y) は x以上y未満の整数を送出します。
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9
9
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10
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-
**
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10
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+
**明らかなバグ**
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11
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-
b_pairs
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11
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+
b_pairsを毎回上書きして、前の周回のデータを吹っ飛ばしてます。
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12
12
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13
13
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---
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14
14
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こんなのを書きたかったのでは。何が違うか見比べてみて下さい。
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2
修正
answer
CHANGED
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@@ -21,7 +21,8 @@
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21
21
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b_pairs = []
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22
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for i in range(2, n+1):
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23
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b_pairs += list(itertools.combinations(b, i))
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24
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-
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24
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+
# 単に b_pairs += itertools.combinations(b, i) でも可
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25
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+
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25
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print(b_pairs)
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26
27
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```
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27
28
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1
追記
answer
CHANGED
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@@ -28,4 +28,17 @@
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28
28
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**実行結果** [Wandbox](https://wandbox.org/permlink/fJ8bgVnEuyTOAWJu)
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29
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```
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30
30
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[(1, 2), (1, 3), (2, 3), (1, 2, 3)]
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31
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+
```
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32
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+
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33
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+
おまけ
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34
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+
---
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35
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+
こういうときは[more-itertools](https://more-itertools.readthedocs.io/en/stable/index.html)が便利です。
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36
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+
```Python
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37
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+
>>> list(more_itertools.powerset(b))
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38
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[(), (1,), (2,), (3,), (1, 2), (1, 3), (2, 3), (1, 2, 3)]
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39
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>>> [s for s in more_itertools.powerset(b)]
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40
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[(), (1,), (2,), (3,), (1, 2), (1, 3), (2, 3), (1, 2, 3)]
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41
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+
>>>
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42
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>>> [s for s in more_itertools.powerset(b) if len(s) >= 2]
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43
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+
[(1, 2), (1, 3), (2, 3), (1, 2, 3)]
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31
44
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```
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