nest dict algo

nested_dict.py

from collections import defaultdict
from itertools import chain
from operator import methodcaller

# dictionaries with non-equal keys, values all lists for simplicity
one = {'a': {1, 2}, 'c': [5, 6], 'b': [3, 4], 'e': [6.2]}
two = {'a': {2.4, 3.4}, 'c': [5.6, 7.6], 'b': [3.5, 4.5], 'f': [1.3]}
three = {'a': [1.2], 'c': [3.4], 'b': [2.3], 'e': [3.1],'f':[1,2,3,4,5]}
dict_list = [one,two,three]

# initialise defaultdict of lists
dd = defaultdict(list)

# iterate dictionary items
dict_items = map(methodcaller('items'), (dict_list))


for k,  v in chain.from_iterable(dict_items):
    dd[k].extend(v)

print(dict(dd))