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- from itertools import groupby
- from operator import itemgetter
- from statistics import mean
- data = [{'age': 18, 'rate': 35}, {'age': 18, 'rate': 28}, {'age': 50, 'rate': 25}]
- [(k, mean(i['rate'] for i in g)) for k, g in groupby(data, key=itemgetter('age'))]
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