How can I create an ordered dictionary from json in Python

Question

I am posting the form and then grabbing the json to form the dict .

myd = \
{'a': {'b': 'c1', 'd': 'f1'},
 'b': {'bb': 'c2', 'dd': 'f2'},
 'c': {'bbb': 'c3', 'ddd': 'f3'}
}

Now I am using josn.loads to convert that into python dict

I am doing this

        headers = DefaultOrderedDict(list, json.loads(request.POST.get('myd')))

Can I do an ordered, default dict in Python?

after doing that my order of the dict gets changed like this

  myd = \
    {'a': {'b': 'c1', 'd': 'f1'},
     'c': {'bbb': 'c3', 'ddd': 'f3'},
     'b': {'bb': 'c2', 'dd': 'f2'},
}

How can I maintain the order?

You probably just need a sorted call somewhere ... where do you get DefaultOrderedDict from?! — wim
– wim, Commented May 3, 2013 at 2:19
. I don't want to sort by any key but i just want to have the same order as original That came from here stackoverflow.com/questions/6190331/… — user2330497
– user2330497, Commented May 3, 2013 at 2:22

Bill Lynch · Accepted Answer · 2013-05-03 02:29:10Z

4

I believe you should do:

json.loads(request.POST.get('myd'), object_pairs_hook=collections.OrderedDict)

You can see some documentation about the object_pairs_hook keyword in the documentation.

answered May 3, 2013 at 2:29

Bill Lynch

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Comments

csurfer · Accepted Answer · 2013-05-03 02:28:47Z

0

Purpose of the python dictionary object is to provide you with O(1) access to key value pairs. As a result the dictionary may choose to arrange it in different order for better performance needs. Having said that you can always do something similar to :

for key in sorted(myd.iterkeys()):
    print "%s: %s" % (key, myd[key])

answered May 3, 2013 at 2:28

csurfer

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