old_contents: #! /usr/bin/env python
  # -*- coding: utf-8 -*-
  # vim:fenc=utf-8
  #
  # Copyright © 2014 uralbash <root@uralbash.ru>
  #
  # Distributed under terms of the MIT license.
  from .mixins import BaseNestedSets
  
  __version__ = "0.0.8"
  __mixins__ = [BaseNestedSets]
  
new_contents: #! /usr/bin/env python
  # -*- coding: utf-8 -*-
  # vim:fenc=utf-8
  #
  # Copyright © 2014 uralbash <root@uralbash.ru>
  #
  # Distributed under terms of the MIT license.
  
  from sqlalchemy.orm import mapper
  from .mixins import BaseNestedSets
  from .events import TreesManager
  
  __version__ = "0.0.8"
  __mixins__ = [BaseNestedSets]
  __all__ = ['BaseNestedSets', 'mptt_sessionmaker']
  
  tree_manager = TreesManager(BaseNestedSets)
  tree_manager.register_mapper(mapper)
  mptt_sessionmaker = tree_manager.register_factory
  
subject: Make a default tree manager importable from the package.