code: def get_simple_dirs(self, simple_dir: Path) -> List[Path]:
          
          if self.hash_index:
              # We are using index page directory hashing, so the directory
              # format is /simple/f/foo/.  We want to return a list of dirs
              # like "simple/f".
              subdirs = [simple_dir / x for x in simple_dir.iterdir() if x.is_dir()]
          else:
              # This is the traditional layout of /simple/foo/.  We should
              # return a single directory, "simple".
              subdirs = [simple_dir]
          return subdirs
docs: Return a list of simple index directories that should be searched
          for package indexes when compiling the main index page.