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hughdbrown/elisabethirgens.py

Last active December 23, 2021 17:48
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Alternative sum of list of dictionaries
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elisabethirgens.py
# O(n) alternative to:
# https://elisabethirgens.github.io/notes/2021/12/step-away/
from collections import defaultdict
mylist = [
{'thing': 'A', 'count': 4},
{'thing': 'B', 'count': 2},
{'thing': 'A', 'count': 6},
]
tmp = defaultdict(int)
for d in mylist:
tmp[d['thing']] += d['count']
mylist = [{'thing': key, 'count': value} for key, value in tmp.items()]
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