Efficient way to order a dictionary by value and stringify it

Question

I have a dictionary with string keys and int values

for word in coocc[query]:
    resp[word]=coocc[query][word]

{"share": 1, "pizza": 3, "eating": 1,...}

I need to sort by value and return a json string.

The following works:

sortedList=sorted(resp.items(), key=operator.itemgetter(1), reverse=True)
sortedDict=collections.OrderedDict(sortedList)
return json.dumps(sortedDict)

'{"cheese": 4, "pizza": 3, "table": 3,..}

but it doesn't seems very efficient to me

might be easier to read in multiple lines, but that's just about the best you can do really. It's fine. — Paritosh Singh, May 30 '19 at 06:07
Which Python version are you using? CPythpn 3.6+ and PyPy 3 preserve insertion order of dict, meaning you don’t needrthe slightly heavier OrderedDict. — MisterMiyagi, May 30 '19 at 06:08

score 0 · Answer 1 · edited May 30 '19 at 06:23

0

json.dumps(sorted(yourdict.items(), key=operator.itemgetter(1),reverse=True))

you can find more details Here

edited May 30 '19 at 06:23

eddie

415
4
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answered May 30 '19 at 06:11

Fahim Ahmed

141
11

If you skip the dict step it becomes '[["cheese", 4], ["pizza", 3], ["table", 3], – eddie May 30 '19 at 06:18
i corrected your answer for the specifics of the question – eddie May 30 '19 at 06:19

ncica · Answer 2 · 2019-05-31T08:02:04.293

Python 3 solution:

d = {"share": 1, "pizza": 3, "eating": 1,"table": 5, "cheese": 4 }
sorted = dict(sorted(d.items(), key=lambda x: x[1]))
print(sorted)
print (json.dumps(sorted))

output:

{'share': 1, 'eating': 1, 'pizza': 3, 'cheese': 4, 'table': 5}
{"share": 1, "eating": 1, "pizza": 3, "cheese": 4, "table": 5}

EDIT:

import json
d = {"share": 1, "pizza": 3, "eating": 1,"table": 5, "cheese": 4 }
sorted = dict(sorted(d.items(), key=lambda x: x[1], reverse = True))
print(sorted)
print (json.dumps(sorted))

output:

{'table': 5, 'cheese': 4, 'pizza': 3, 'share': 1, 'eating': 1}
{"table": 5, "cheese": 4, "pizza": 3, "share": 1, "eating": 1}

where do you fit the reverse=True? – eddie May 31 '19 at 03:39 — eddie, May 31 '19 at 03:39

Efficient way to order a dictionary by value and stringify it

2 Answers2