回答編集履歴
1
別解
answer
CHANGED
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@@ -7,4 +7,15 @@
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7
7
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score = [500, 400, 300, 200, 100, 50, 0]
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8
8
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amount = [3, 8, 3, 5, 10, 3, 1]
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9
9
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print(wighted_avg(score, amount, 10))
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10
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+
```
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11
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+
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12
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+
以下は別解。itertools祭り版。
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13
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```python
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14
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from itertools import chain
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15
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from itertools import islice
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16
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from itertools import repeat
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17
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18
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def wighted_avg(score, amount, top_n):
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19
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flatten = chain.from_iterable(map(repeat, score, amount))
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20
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return sum(islice(flatten, top_n)) / top_n
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10
21
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```
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