Python: Elegantly merge dictionaries with sum() of values [duplicate]

Answer 1

from collections import Counter


a = [("13.5",100)]
b = [("14.5",100), ("15.5", 100)]
c = [("15.5",100), ("16.5", 100)]

inp = [dict(x) for x in (a,b,c)]
count = Counter()
for y in inp:
  count += Counter(y)
print(count)

output:

Counter({'15.5': 200, '14.5': 100, '16.5': 100, '13.5': 100})

Edit: As duncan suggested you can replace these 3 lines with a single line:

   count = Counter()
    for y in inp:
      count += Counter(y)

replace by : count = sum((Counter(y) for y in inp), Counter())