Python Check if two list of jsons are equal

Question

I have two list of JSON objects:

[{u'amount': 12000, u'address': u'mqdofsXHpePPGBFXuwwypAqCcXi48Xhb2f'},
 {u'amount': 1000, u'address': u'mkVuZV2kVtMzddQabFDanFi6DTwWYtgiCn'}]

[{"amount": 12000, "address": "mqdofsXHpePPGBFXuwwypAqCcXi48Xhb2f"},
 {"amount": 1000, "address": "mkVuZV2kVtMzddQabFDanFi6DTwWYtgiCn"}]

They might come in different orders, or one might be a subset of the other or just different addresses, I need a function to just say True if both include the same addresses/amounts or False if they are different.

I guess the problem is one has unicode keys/values but the other ones are strings.

I've spent too much time on this simple issue that have no clue what else to do.

That isn't valid JSON, it looks like the Python dict literal syntax. — Asad Saeeduddin, Apr 02 '15 at 20:44
I printed them out for logging with ("%s - %s" % (outputs, new_outputs)) — Shayan, Apr 02 '15 at 20:47
@Asad yes, the pair matters. even if you swap the amounts for each addresses it should return False — Shayan, Apr 02 '15 at 20:48
http://stackoverflow.com/questions/7611854/checking-if-two-massive-python-dictionaries-are-equivalent http://stackoverflow.com/questions/4527942/comparing-two-dictionaries-in-python http://www.tutorialspoint.com/python/dictionary_cmp.htm — Celeo, Apr 02 '15 at 20:48

Óscar López · Answer 1 · 2015-04-02T20:51:12.150

2

The trick here is to use a data structure that ignores the order in which elements appear when performing an equality comparison - say, a set. Try this, which uses set comprehensions for extracting the addresses and amounts from each list:

{(d['address'], d['amount']) for d in lst1} == {(d['address'], d['amount']) for d in lst2}

edited Apr 02 '15 at 20:51

answered Apr 02 '15 at 20:46

Óscar López

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the key value should be the same to be True, both address and the amount. – Shayan Apr 02 '15 at 20:47
anyhow I'd try a nested if – Shayan Apr 02 '15 at 20:48
@Shayanbahal You can just concatenate the address and amount and compare. – Asad Saeeduddin Apr 02 '15 at 20:48
1

@Shayanbahal {(json['address'], json['amount']) for json in lst1} == {(json['address'], json['amount']) for json in lst2} – Asad Saeeduddin Apr 02 '15 at 20:49

score 0 · Accepted Answer · answered Apr 07 '15 at 15:53

so in the end this is what I wrote, might not be the most efficient way but it works!

def json_equal(json1,json2):

   number_of_items = len(json1)
   for item in json1:
       for item2 in json2:
           if item["address"] == item2["address"]:
               if item["amount"] == item2["amount"]:
                   number_of_items -= 1
                   break
           else:
               continue
   if number_of_items == 0:
       return True
   else:
       return False

Python Check if two list of jsons are equal

2 Answers2