Question

How can i find the count of duplicates in this list.

>>> result = SiteTags.objects.values('content_type','object_id')
>>> result
[{'object_id': 1, 'content_type': 46}, {'object_id': 1, 'content_type': 46}, {'object_id': 2, 'content_type': 42}]

Is there anyway to find in query? or through an other way?

Thanks!

Answer 1

set(tuple(sorted(r.iteritems())) for r in result)

gives you a set of unique elements in this list. Take its length and compare it to len(result).

To get each element and its count within the result:

counter = {}
for r in result:
    tup = tuple(sorted(r.iteritems()))
    counter[tup] = counter.get(tup, 0) + 1
for tup, cnt in counter.iteritems():
    print dict(tup), cnt

prints:

{'object_id': 2, 'content_type': 42} 1
{'object_id': 1, 'content_type': 46} 2