回答編集履歴
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Update
test
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@@ -31,3 +31,49 @@
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'福岡': {'いちご': 2, 'ばなな': 1, 'ひよこ': 1}}
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```
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**追記**
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Python 3.9 以降で使える `|=` operator と defaultdict を使う場合。
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```python
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from collections import Counter, defaultdict
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result = defaultdict(dict)
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for (c, g), v in Counter(target).items():
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result[c] |= {g: v}
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result = dict(result)
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from pprint import pprint
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pprint(result)
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#
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{'千葉': {'いちご': 1, 'ばなな': 1},
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'大阪': {'ばなな': 3, 'りんご': 1},
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'東京': {'いちご': 1, 'ばなな': 3, 'ひよこ': 1, 'りんご': 1},
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'福岡': {'いちご': 2, 'ばなな': 1, 'ひよこ': 1}}
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```
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