CODEWITHSUNDEEP
pythondictionary
Roberto
Roberto

Reputation: 11

Is there a way to group several keys which points to the same value in a dictionary?

Is there a way to group several keys which points to the same value in a dictionary?

Upvotes: 1

Views: 103

Answers (2)

martineau
martineau

Reputation: 123423

Not exactly sure you want the result structured, but here's one guess:

from collections import defaultdict

mydict = {'a': 1, 'b': 2, 'c': 3, 'd': 2, 'e': 4, 'f': 2, 'g': 4}

tempdict = defaultdict(list)
for k,v in mydict.iteritems():
    tempdict[v].append(k)

groupedkeysdict = {}
for k,v in tempdict.iteritems():
    groupedkeysdict[tuple(v) if len(v)>1 else v[0]] = k

print groupedkeysdict
# {'a': 1, 'c': 3, ('e', 'g'): 4, ('b', 'd', 'f'): 2}

Upvotes: 2

John La Rooy
John La Rooy

Reputation: 304137

from collections import defaultdict

newdict = defaultdict(list)
for k,v in originaldict.items():
    newdict[v].append(k)

Upvotes: 3

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