Combine dictionary values
Combines two or more dictionaries, creating a list of values for each key.
- Create a new
collections.defaultdict
withlist
as the default value for each key and loop overdicts
. - Use
dict.append()
to map the values of the dictionary to keys. - Use
dict()
to convert thecollections.defaultdict
to a regular dictionary.
from collections import defaultdict def combine_values(*dicts): res = defaultdict(list) for d in dicts: for key in d: res[key].append(d[key]) return dict(res) d1 = {'a': 1, 'b': 'foo', 'c': 400} d2 = {'a': 3, 'b': 200, 'd': 400} combine_values(d1, d2) # {'a': [1, 3], 'b': ['foo', 200], 'c': [400], 'd': [400]}