old_contents: from . import lists  # noqa
  from . import django  # noqa
  
  __all__ = ['lists', 'django']
  
new_contents: from . import lists  # noqa
  from . import django  # noqa
  from . import basefilters  # noqa
  
  __all__ = ['lists', 'django', 'basefilters']
  
subject: Include basefilter in __init__.