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python def get_comments_update(request, last_time):
    dt = datetime.fromtimestamp(float(last_time) / 1000.0)
    results = Comment.objects.filter(creation_time__gt=dt)
    print 'get comments update, result size: ', len(results)
    response_text = serializers.serialize('json', results,
                                          use_natural_foreign_keys=True)
    # print response_text
    return HttpResponse(response_text, content_type='application/json')