old_contents: import imp
  from importlib import import_module
  
  from django.apps import AppConfig, apps
  from django.db.models.signals import post_delete
  
  
  class AlreadyRegistered(Exception):
      pass
  
  
  class BaseLinkcheckConfig(AppConfig):
      name = 'linkcheck'
      verbose_name = "Linkcheck"
  
      all_linklists = {}
  
      def ready(self):
          self.build_linklists()
  
      def build_linklists(self):
          """Autodiscovery of linkLists"""
          for app in apps.get_app_configs():
              try:
                  imp.find_module('linklists', [app.path])
              except ImportError:
                  continue
              the_module = import_module("%s.linklists" % app.name)
              try:
                  for k in the_module.linklists.keys():
                      if k in self.all_linklists.keys():
                          raise AlreadyRegistered('The key %s is already registered in all_linklists' % k)
  
                  for l in the_module.linklists.values():
                      for l2 in self.all_linklists.values():
                          if l.model == l2.model:
                              raise AlreadyRegistered('The LinkList %s is already registered in all_linklists' % l)
                  self.all_linklists.update(the_module.linklists)
              except AttributeError:
                  pass
          # Add a reference to the linklist in the model. This change is for internal hash link,
          # But might also be useful elsewhere in the future
          for key, linklist in self.all_linklists.items():
              setattr(linklist.model, '_linklist', linklist)
  
  
  class LinkcheckConfig(BaseLinkcheckConfig):
      def ready(self):
          from .linkcheck_settings import DISABLE_LISTENERS
          from .listeners import register_listeners
          super().ready()
  
          if not DISABLE_LISTENERS:
              register_listeners()
  
          from .models import Link, link_post_delete
          post_delete.connect(link_post_delete, sender=Link)
  
new_contents: import importlib
  
  from django.apps import AppConfig, apps
  from django.db.models.signals import post_delete
  
  
  class AlreadyRegistered(Exception):
      pass
  
  
  class BaseLinkcheckConfig(AppConfig):
      name = 'linkcheck'
      verbose_name = "Linkcheck"
  
      all_linklists = {}
  
      def ready(self):
          self.build_linklists()
  
      def build_linklists(self):
          """Autodiscovery of linkLists"""
          for app in apps.get_app_configs():
              module_name = "%s.linklists" % app.name
              if not importlib.util.find_spec(module_name):
                  continue
              the_module = importlib.import_module(module_name)
              try:
                  for k in the_module.linklists.keys():
                      if k in self.all_linklists.keys():
                          raise AlreadyRegistered('The key %s is already registered in all_linklists' % k)
  
                  for l in the_module.linklists.values():
                      for l2 in self.all_linklists.values():
                          if l.model == l2.model:
                              raise AlreadyRegistered('The LinkList %s is already registered in all_linklists' % l)
                  self.all_linklists.update(the_module.linklists)
              except AttributeError:
                  pass
          # Add a reference to the linklist in the model. This change is for internal hash link,
          # But might also be useful elsewhere in the future
          for key, linklist in self.all_linklists.items():
              setattr(linklist.model, '_linklist', linklist)
  
  
  class LinkcheckConfig(BaseLinkcheckConfig):
      def ready(self):
          from .linkcheck_settings import DISABLE_LISTENERS
          from .listeners import register_listeners
          super().ready()
  
          if not DISABLE_LISTENERS:
              register_listeners()
  
          from .models import Link, link_post_delete
          post_delete.connect(link_post_delete, sender=Link)
  
subject: remove usage of deprecated imp module