old_contents: from django.core.management.base import BaseCommand, CommandError
  
  from ...utils import get_backend
  
  
  class Command(BaseCommand):
      help = "Command to deduplicate tasks in a redis-backed queue"
  
      def add_arguments(self, parser):
          parser.add_argument(
              'queue',
              action='store',
              help="The queue to deduplicate",
          )
  
      def handle(self, queue, **options):
          backend = get_backend(queue)
  
          if not hasattr(backend, 'deduplicate'):
              raise CommandError(
                  "Configured backend '%s.%s' doesn't support deduplication" % (
                      type(backend).__module__,
                      type(backend).__name__,
                  ),
              )
  
          original_size, new_size = backend.deduplicate(queue)
  
          self.stdout.write(
              "Deduplication reduced the queue from %d jobs to %d job(s)" % (
                  original_size,
                  new_size,
              ),
          )
  
new_contents: from django.core.management.base import BaseCommand, CommandError
  
  from ...utils import get_backend
  
  
  class Command(BaseCommand):
      help = "Command to deduplicate tasks in a redis-backed queue"
  
      def add_arguments(self, parser):
          parser.add_argument(
              'queue',
              action='store',
              help="The queue to deduplicate",
          )
  
      def handle(self, queue, **options):
          backend = get_backend(queue)
  
          if not hasattr(backend, 'deduplicate'):
              raise CommandError(
                  "Configured backend '%s.%s' doesn't support deduplication" % (
                      type(backend).__module__,
                      type(backend).__name__,
                  ),
              )
  
          original_size, new_size = backend.deduplicate(queue)
  
          if original_size == new_size:
              self.stdout.write(
                  "No duplicate jobs detected (queue length remains %d)" % (
                      original_size,
                  ),
              )
          else:
              self.stdout.write(
                  "Deduplication reduced the queue from %d jobs to %d job(s)" % (
                      original_size,
                      new_size,
                  ),
              )
  
subject: Improve output when no deduplication happened