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pythonjsondictionary
Jane Wayne
Jane Wayne

Reputation: 8855

How do I iterate over a dictionary created by JSON in the order of key-value pairs specified?

I have a JSON that looks like the following (this example is just a toy example to illustrate the point, default iteration might work by luck).

{ "A": 1, "B": 2, "C": 3 }

I can load this JSON into a Python (v2.7) dictionary.

with open('/path/to/json/file') as f:
     json_data = json.load(f)

I then iterate over the key-value pairs as follows.

for k, v in json_data.iteritems():
     print('{}, {}'.format(k, v))

What is printed is the following.

A, 1
C, 3
B, 2

What I want is to be able to iterate over the items in the order that was specified in the JSON. So, my expected output should be.

A, 1
B, 2
C, 3

Is there any way to read in and store the key-value pairs from JSON to a Python dictionary such that when I iterate over them, the order specified by JSON is preserved and read back in such order?

I do not have control with the producer of the JSON to store the data in an array (discussed here for Java). I am wondering if there is a LinkedHashMap like in Java with Python that perhaps I may use with json.load to preserve the insertion order for reading.

Any help is appreciated.

Upvotes: 0

Views: 247

Answers (1)

T Burgis
T Burgis

Reputation: 1435

You can get the json loader to build an OrderedDict:

import json
import collections

with open('example.json') as f:
    json_object = json.load(f,object_pairs_hook=collections.OrderedDict)

Upvotes: 4

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