Question

How to reverse key and value in dictionary with Python

Answer 1

from collections import defaultdict

d = {'key1':34, 'key2':89, 'key3':12, 'key4':72, 'key5':90}

inverted = defaultdict(list)

{inverted[v].append(k) for k, v in d.items()}

d = dict(inverted)

print(d)


    
    
    
'''
run:

{34: ['key1'], 89: ['key2'], 12: ['key3'], 72: ['key4'], 90: ['key5']}

'''

 

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Answer 2

dict = {'key1':34, 'key2':89, 'key3':12, 'key4':72, 'key5':90}

dict = {v: k for k, v in dict.items()}

print(dict)


    
    
'''
run:

{34: 'key1', 89: 'key2', 12: 'key3', 72: 'key4', 90: 'key5'}

'''

 

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