回答編集履歴
1
test
CHANGED
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@@ -25,3 +25,17 @@
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# {3: ['A', 'B', 'A'], 2: ['C', 'D'], 1: ['E']}
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```
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#### 追記
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`itertools.groupby()` を使う場合。
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```python
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from itertools import groupby
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keyfunc = lambda p: p.num
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res = {k: [p.place for p in g] for k, g in groupby(sorted(pls, key=keyfunc), key=keyfunc)}
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print(res)
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# {1: ['E'], 2: ['C', 'D'], 3: ['A', 'B', 'A']}
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```
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