回答編集履歴
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長いプログラムを追加
test
CHANGED
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@@ -1,6 +1,4 @@
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短く書くとこうです。
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-
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-
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2
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3
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4
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@@ -21,3 +19,57 @@
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[{'id': 'A', 'count': 2}, {'id': 'B', 'count': 1}]
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```
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分かりにくいかもしれないので長いのも作ってみました。
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```python
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a = [{'id': 'A', 'date': '2020-05-01'},
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{'id': 'A', 'date': '2020-05-02'},
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{'id': 'B', 'date': '2020-05-01'}]
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id_l = []
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for y in a:
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id_l.append(y['id'])
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print(id_l)
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id_s = set(id_l)
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print(id_s)
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d = []
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for i in id_s:
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contain_i =[]
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for x in a:
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if x['id'] == i:
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contain_i.append(x)
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count = len(contain_i)
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d_i = {'id': i, 'count': count}
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d.append(d_i)
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print(d)
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75
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```
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