Combine Dictionary Values

Introduction

Dictionaries are a fundamental data structure in Python, and they are used to store key-value pairs. Sometimes, we may need to combine the values of two or more dictionaries into a single dictionary. In this challenge, you will write a function that takes two or more dictionaries as arguments and returns a new dictionary that combines the values of the input dictionaries.

Combine Dictionary Values

Write a function combine_values(*dicts) that takes two or more dictionaries as arguments and returns a new dictionary that combines the values of the input dictionaries. The function should perform the following steps:

1. Create a new collections.defaultdict with list as the default value for each key.
2. Loop over the input dictionaries and for each dictionary:
   • Loop over the keys of the dictionary.
   • Append the value of the key to the list of values for that key in the defaultdict.
3. Convert the defaultdict to a regular dictionary using the dict() function.
4. Return the resulting dictionary.

The function should have the following signature:

def combine_values(*dicts):
    pass

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]}

Summary

In this challenge, you have learned how to combine the values of two or more dictionaries into a single dictionary. You have written a function that takes two or more dictionaries as arguments and returns a new dictionary that combines the values of the input dictionaries.