回答編集履歴
3
今更だけど、無駄な処理をしてたので修正。
answer
CHANGED
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@@ -10,8 +10,8 @@
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10
10
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11
11
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def my_shuffle(src):
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13
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dst = src[:]
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while True:
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-
dst = src[:]
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random.shuffle(dst)
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if src[0] != dst[0]:
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@@ -31,28 +31,28 @@
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main()
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```
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33
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34
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-
**実行結果** [Wandbox](https://wandbox.org/permlink/
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34
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+
**実行結果** [Wandbox](https://wandbox.org/permlink/EKjPqj85WXTMt1wh)
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35
35
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```
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36
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-
[3, 2, 1]
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[2, 1, 3]
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[3, 1, 2]
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[1, 3, 2]
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[3, 2, 1]
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40
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[1, 3, 2]
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[2, 3, 1]
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[
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[3, 2, 1]
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[2, 1, 3]
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[1, 3, 2]
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[2, 1, 3]
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[3, 2, 1]
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[2, 1, 3]
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[1, 2, 3]
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[3, 1, 2]
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[2, 1, 3]
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[1, 3, 2]
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[3, 2, 1]
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-
[2, 3, 1]
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50
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-
[3, 1, 2]
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[2, 1, 3]
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[1, 3, 2]
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[3, 1, 2]
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[2, 3, 1]
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54
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[3,
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55
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[3, 1, 2]
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55
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-
[1, 2, 3]
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56
56
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```
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57
57
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58
58
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上記コードの`my_shuffle`では第一要素が変わるまで何回もシャッフルし続けています。
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@@ -65,8 +65,8 @@
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65
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def my_shuffle(src):
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dst = src[:]
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while True:
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69
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-
dst = src[:]
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70
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random.shuffle(dst)
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71
71
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72
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if src[0] != dst[0]:
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2
追記
answer
CHANGED
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@@ -1,7 +1,7 @@
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1
1
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まず、Pythonの辞書は順序を保証しません。
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2
2
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ですので、順序を取り扱いたいときは辞書は用いてはなりません。
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3
3
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4
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-
一度`list(
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4
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+
一度`list(辞書.keys())`を取得したら、それを使うようにしてください。
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5
5
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6
6
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---
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7
7
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リストの第一要素を毎回変えたい場合、例えば次のような実装が考えられます。
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@@ -55,4 +55,35 @@
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55
55
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[1, 2, 3]
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56
56
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```
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57
57
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58
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-
上記コードの`my_shuffle`では第一要素が変わるまで何回もシャッフルし続けています。
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58
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+
上記コードの`my_shuffle`では第一要素が変わるまで何回もシャッフルし続けています。
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59
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+
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60
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+
書いてみた
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61
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+
---
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62
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+
上記の点を踏まえると次のように書くことが出来ます。
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63
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+
```Python
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64
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import random
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65
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+
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66
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67
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def my_shuffle(src):
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68
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while True:
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69
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dst = src[:]
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70
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random.shuffle(dst)
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71
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72
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if src[0] != dst[0]:
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73
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break
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74
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75
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return dst
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76
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+
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77
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+
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78
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my_dict = {
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79
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'a': 16, 'b': 29, 'c': 35, 'd': 55, 'e': 57, 'n': 70, 'o': 72, 'p': 101, 'q': 103
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80
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}
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81
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keys = list(my_dict.keys())
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82
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83
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n = int(input())
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84
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for _ in range(n):
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85
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keys = my_shuffle(keys)
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86
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print(keys[:2])
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87
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```
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88
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+
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89
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+
関数の使い方にかなり無駄があるので、そのような基礎的な部分も改めて復習してください。
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1
コードの変更
answer
CHANGED
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@@ -9,54 +9,50 @@
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9
9
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import random
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10
10
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11
11
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12
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-
def shuffled(src):
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13
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"""引数自体を変更せずに、シャッフルしたリストを返す。"""
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14
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-
dst = src[:]
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15
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random.shuffle(dst)
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16
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-
return dst
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17
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-
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18
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-
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19
12
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def my_shuffle(src):
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13
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while True:
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20
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-
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14
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+
dst = src[:]
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15
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random.shuffle(dst)
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16
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+
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21
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-
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17
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+
if src[0] != dst[0]:
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22
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-
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18
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break
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23
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-
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19
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+
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24
20
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return dst
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25
21
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26
22
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27
23
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def main():
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28
24
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my_list = [1, 2, 3]
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29
25
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for _ in range(20):
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26
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my_list = my_shuffle(my_list)
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30
27
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print(my_list)
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31
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-
my_list = my_shuffle(my_list)
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32
28
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33
29
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34
30
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if __name__ == '__main__':
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35
31
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main()
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36
32
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```
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|
37
33
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|
|
38
|
-
**実行結果** [Wandbox](https://wandbox.org/permlink/
|
|
34
|
+
**実行結果** [Wandbox](https://wandbox.org/permlink/ZqJTMqamvafVMi3Q)
|
|
39
35
|
```
|
|
40
|
-
[1, 2, 3]
|
|
41
36
|
[3, 2, 1]
|
|
37
|
+
[2, 1, 3]
|
|
42
38
|
[1, 3, 2]
|
|
43
|
-
[3, 1, 2]
|
|
44
|
-
[2, 1, 3]
|
|
45
|
-
[3, 1, 2]
|
|
46
39
|
[2, 3, 1]
|
|
47
40
|
[1, 2, 3]
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|
41
|
+
[2, 1, 3]
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|
48
42
|
[3, 2, 1]
|
|
49
|
-
[2,
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|
43
|
+
[2, 1, 3]
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|
44
|
+
[1, 2, 3]
|
|
45
|
+
[3, 1, 2]
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|
46
|
+
[2, 1, 3]
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|
50
47
|
[1, 3, 2]
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|
51
|
-
[2, 1, 3]
|
|
52
48
|
[3, 2, 1]
|
|
53
49
|
[2, 3, 1]
|
|
50
|
+
[3, 1, 2]
|
|
54
|
-
[
|
|
51
|
+
[2, 1, 3]
|
|
52
|
+
[3, 1, 2]
|
|
53
|
+
[2, 3, 1]
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|
55
54
|
[3, 2, 1]
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|
56
55
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[1, 2, 3]
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|
57
|
-
[2, 1, 3]
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|
58
|
-
[3, 1, 2]
|
|
59
|
-
[1, 3, 2]
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|
60
56
|
```
|
|
61
57
|
|
|
62
58
|
上記コードの`my_shuffle`では第一要素が変わるまで何回もシャッフルし続けています。
|