回答編集履歴
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test
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@@ -7,3 +7,45 @@
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何度も検索するのであれば、最初にそのための辞書を作ってからの方が速くなります。
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---
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衝突回避版。
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```python
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test_dict = {
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"A":["A","B","C"],
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"B":["B","C","D"],
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"X":["X","Y","Z"],
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}
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test_dict_1 = {}
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for k, v in test_dict.items():
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if v[1] in test_dict_1:
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test_dict_1[v[1]].append(k)
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else:
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test_dict_1[v[1]] = [k]
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print([test_dict[k] for k in test_dict_1['B']])
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```
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