code: def iter_filth_clss():
      
      return iter_subclasses(
          os.path.dirname(os.path.abspath(__file__)),
          Filth,
          _is_abstract_filth,
      )
docs: Iterate over all of the filths that are included in this sub-package.
      This is a convenience method for capturing all new Filth that are added
      over time.