new_contents: from __future__ import absolute_import
  
  from django.core.management.base import BaseCommand
  
  from zerver.lib.actions import do_rename_stream
  from zerver.models import Realm, get_realm
  
  class Command(BaseCommand):
      help = """Change the stream name for a realm.
  
  Usage: python manage.py rename-stream <domain> <old name> <new name>"""
  
      def handle(self, *args, **options):
          if len(args) != 3:
              print "Please provide a domain and the old and new names."
              exit(1)
  
          domain, old_name, new_name = args
  
          try:
              realm = get_realm(domain)
          except Realm.DoesNotExist:
              print "Unknown domain %s" % (domain,)
              exit(1)
  
          do_rename_stream(realm, old_name, new_name)
  
subject: Add a management command to rename a stream.