Question

How to group values in a dictionary based on keys in Python

Answer 1

from collections import defaultdict

keyval = [('a', 1), ('b', 2), ('a', 3), ('a', 4), ('b', 5), ('c', 6)]

grouped_dict = defaultdict(list)
for key, value in keyval:
    grouped_dict[key].append(value)

print(grouped_dict)
print((dict(grouped_dict)))

 
 
'''
run:
 
defaultdict(<class 'list'>, {'a': [1, 3, 4], 'b': [2, 5], 'c': [6]})
{'a': [1, 3, 4], 'b': [2, 5], 'c': [6]}

'''

 

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