code: def _handle_ns(packageName, path_item):
      
  
      importer = get_importer(path_item)
      if importer is None:
          return None
  
      # capture warnings due to #1111
      with warnings.catch_warnings():
          warnings.simplefilter("ignore")
          loader = importer.find_module(packageName)
  
      if loader is None:
          return None
      module = sys.modules.get(packageName)
      if module is None:
          module = sys.modules[packageName] = types.ModuleType(packageName)
          module.__path__ = []
          _set_parent_ns(packageName)
      elif not hasattr(module, '__path__'):
          raise TypeError("Not a package:", packageName)
      handler = _find_adapter(_namespace_handlers, importer)
      subpath = handler(importer, path_item, packageName, module)
      if subpath is not None:
          path = module.__path__
          path.append(subpath)
          loader.load_module(packageName)
          _rebuild_mod_path(path, packageName, module)
      return subpath
docs: Ensure that named package includes a subpath of path_item (if needed)