old_contents: from django.core.serializers import json
  from django.http import HttpResponse, Http404
  from django.utils import simplejson
  
  from selectable.registry import registry
  
  
  def get_lookup(request, lookup_name):
  
      lookup_cls = registry.get(lookup_name)
      if lookup_cls is None:
          raise Http404(u'Lookup %s not found' % lookup_name)
  
      lookup = lookup_cls()
      return lookup.results(request)
  
  
new_contents: from django.http import HttpResponse, Http404
  
  from selectable.registry import registry
  
  
  def get_lookup(request, lookup_name):
  
      lookup_cls = registry.get(lookup_name)
      if lookup_cls is None:
          raise Http404(u'Lookup %s not found' % lookup_name)
  
      lookup = lookup_cls()
      return lookup.results(request)
  
  
subject: Remove unused imports.