CODEWITHSUNDEEP
python
Shankar Cabus
Shankar Cabus

Reputation: 9792

Sort dictionary by value of other dictionary in Python

How to sort this dictionary by 'votes' in Python?

{
  1 : {
    'votes' : 2,
    'id' : 10
  },
  2 : {
    'votes' : 10,
    'id' : 12
  },
  3 : {
    'votes' : 98,
    'id' : 14
  }
}

To results in:

{
  3 : {
    'votes' : 98,
    'id' : 14
  },
  2 : {
    'votes' : 10,
    'id' : 12
  },
  1 : {
    'votes' : 2,
    'id' : 10
  }
}

Upvotes: 1

Views: 216

Answers (4)

Kyss Tao
Kyss Tao

Reputation: 531

You could also sort the items in the dictionary:

print sorted(d.items(), key=lambda x: x[1]['votes'], reverse=True)

like Francis' suggestion, but you know the original key for every item.

Upvotes: 0

Francis Avila
Francis Avila

Reputation: 31621

Standard dictionaries do not have an order, so sorting them makes no sense. Both those dictionaries are exactly the same.

Perhaps what you really want is a list?

aslist = originaldict.values()
aslist.sort(key=lambda item:item['votes'], reverse=True)

This will extract the items from your dict as a list and resort the list by votes.

Upvotes: 0

Andrew Clark
Andrew Clark

Reputation: 208475

Dictionaries are unsorted, if you want to be able to access elements from you dictionary in a specific order you can use an OrderedDict as in jcollado's answer, or just sort the list of keys by whatever metric you are interested in, for example:

data = {1: {'votes': 2, 'id': 10}, 2: {'votes': 10, 'id': 12}, 3: {'votes': 98, 'id': 14}}
votes_order = sorted(data, key=lambda k: data[k]['votes'], reverse=True)
for key in votes_order:
    print key, ':', data[key]

Output:

3 : {'votes': 98, 'id': 14}
2 : {'votes': 10, 'id': 12}
1 : {'votes': 2, 'id': 10}

Upvotes: 3

jcollado
jcollado

Reputation: 40384

You could use an OrderedDict:

>>> from collections import OrderedDict
>>> od = OrderedDict(sorted(d.items(),
                     key=lambda t: t[1]['votes'],
                     reverse=True))
>>> od
OrderedDict([(3, {'votes': 98, 'id': 14}),
             (2, {'votes': 10, 'id': 12}),
             (1, {'votes': 2, 'id': 10})])

where d is your original dictionary.

Upvotes: 4

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