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| from collections import defaultdict | |
| output = defaultdict(list) | |
| for item in data: | |
| output[item["owner"]].append(item["pet"]) | |
| # output is => | |
| defaultdict(list, | |
| {'Kent': ['Shiner'], | |
| 'Mary': ['Pumpkin', 'Tasha'], | |
| 'Paige': ['Sushi'], | |
| 'Sarah': ['Shiner', 'Mr. Wigglesworth', 'Pupparoo', 'Lucy']}) |
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