Sorting by nested dictionary in Python dictionary

Question

I have below structure

{
    'searchResult' : [{
            'resultType' : 'station',
            'ranking' : 0.5
        }, {
            'resultType' : 'station',
            'ranking' : 0.35
        }, {
            'resultType' : 'station',
            'ranking' : 0.40
        }
    ]
}

and want to get

{
    'searchResult' : [{
            'resultType' : 'station',
            'ranking' : 0.5
        }, {
            'resultType' : 'station',
            'ranking' : 0.4
        }, {
            'resultType' : 'station',
            'ranking' : 0.35
        }
    ]
}

Tried the code without success

result = sorted(result.items(), key=lambda k: k[1][0][1]["ranking"], reverse=True)

Thanks all! But which method is faster d["item"].sort() or sorted()? — SpanishBoy
– SpanishBoy, Commented Aug 19, 2015 at 14:44
possible duplicate of How do I sort a list of dictionaries by values of the dictionary in Python? — PyNEwbie
– PyNEwbie, Commented Aug 19, 2015 at 14:45
@SpanishBoy sorted returns a new object. If you don't need the original object you'd better stick with sort for speed and memory efficiency. — Eli Korvigo
– Eli Korvigo, Commented Aug 19, 2015 at 14:47

Eli Korvigo · Accepted Answer · 2015-08-19 14:39:24Z

5

If you are okay with changing the objects in-place.

a = {
    'searchResult' : [{
                       'resultType' : 'station',
                       'ranking' : 0.5
                      }, {
                       'resultType' : 'station',
                       'ranking' : 0.35
                      }, {
                      'resultType' : 'station',
                      'ranking' : 0.40
                      }]
  }

a["searchResult"].sort(key=lambda d: d["ranking"], reverse=True)

Or you can make a deep copy to keep the original

from copy import deepcopy


srt_dict = deepcopy(a)
srt_dict["searchResult"].sort(key=lambda d: d["ranking"], reverse=True)

answered Aug 19, 2015 at 14:39

Eli Korvigo

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Comments

Padraic Cunningham · Accepted Answer · 2015-08-19 14:40:56Z

5

You can simply do an inplace sort on the list, using key=itemgetter("ranking") and reverse=True:

from operator import itemgetter
d["searchResult"].sort(key=itemgetter("ranking"),reverse=True)

print(d)
{'searchResult': [{'resultType': 'station', 'ranking': 0.5}, {'resultType': 'station', 'ranking': 0.4}, {'resultType': 'station', 'ranking': 0.35}]}

answered Aug 19, 2015 at 14:40

Padraic Cunningham

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CasualDemon · Accepted Answer · 2015-08-19 14:39:58Z

2

You can just sort the list and write over itself in the dictionary.

result = {
    'searchResult' : [{
            'resultType' : 'station',
            'ranking' : 0.5
        }, {
            'resultType' : 'station',
            'ranking' : 0.35
        }, {
            'resultType' : 'station',
            'ranking' : 0.40
        }
    ]
}

result['searchResult'] = sorted(result['searchResult'], key= lambda x: x['ranking'], reverse=True)

answered Aug 19, 2015 at 14:39

CasualDemon

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