old_contents: # flake8: noqa
  from .version import __version__
  from .manager_utils import (
      ManagerUtilsMixin, ManagerUtilsManager, ManagerUtilsQuerySet, post_bulk_operation,
      upsert, bulk_update, single, get_or_none, bulk_upsert, id_dict
  )
  
new_contents: # flake8: noqa
  from .version import __version__
  from .manager_utils import (
      ManagerUtilsMixin, ManagerUtilsManager, ManagerUtilsQuerySet, post_bulk_operation,
      upsert, bulk_update, single, get_or_none, bulk_upsert, id_dict, sync
  )
  
subject: Update __init__.py