class_docstr: Attribute List extension for Python-Markdown 
class_docstr_tok: ["Attribute","List","extension","for","Python-Markdown"]
code: def extendMarkdown(self, md):
      md.treeprocessors.register(
          AttrListTreeprocessor(md), "attr_list", 8
      )
      md.registerExtension(self)
  
file_path: markdown/markdown/extensions/attr_list.py
imports: from __future__ import annotations
  from typing import TYPE_CHECKING
  from .None import Extension
  from ..treeprocessors import Treeprocessor
  import re
label_desc: Use image node_id 1 for calling the AttrListExtension obj's underlying member method code with example usage: obj.extendMarkdown(md) without return types