Python Collections Counter for a List of Dictionaries

Question

I have a dynamically growing list of arrays that I would like to add like values together. Here\'s an example:

{\"something\" : [{\"one\":\"200\"}, {\"three\         


        

Answer 1

One way would be do as follows:

from collections import defaultdict

d = {"something" :
     [{"one":"200"}, {"three":"400"}, {"one":"100"}, {"two":"800"}]}

dd = defaultdict(list)

# first get and group values from the original data structure
# and change strings to ints
for inner_dict in d['something']:
    for k,v in inner_dict.items():
        dd[k].append(int(v))


# second. create output dictionary by summing grouped elemetns
# from the first step.
out_dict =  {k:sum(v) for k,v in dd.items()}

print(out_dict)
# {'two': 800, 'one': 300, 'three': 400}

In here I don't use counter, but defaultdict. Its a two step approach.