class_docstr: Process Definition Lists. 
code: def run(
      self, parent: etree.Element, blocks: list[str]
  ) -> bool | None:
      raw_block = blocks.pop(0)
      m = self.RE.search(raw_block)
      terms = [
          term.strip()
          for term in raw_block[: m.start()].split("\n")
          if term.strip()
      ]
      block = raw_block[m.end() :]
      no_indent = self.NO_INDENT_RE.match(block)
      if no_indent:
          d, theRest = (block, None)
      else:
          d, theRest = self.detab(block)
      if d:
          d = "{}\n{}".format(m.group(2), d)
      else:
          d = m.group(2)
      sibling = self.lastChild(parent)
      if not terms and sibling is None:
          # This is not a definition item. Most likely a paragraph that
          # starts with a colon at the beginning of a document or list.
          blocks.insert(0, raw_block)
          return False
      if not terms and sibling.tag == "p":
          # The previous paragraph contains the terms
          state = "looselist"
          terms = sibling.text.split("\n")
          parent.remove(sibling)
          # Acquire new sibling
          sibling = self.lastChild(parent)
      else:
          state = "list"
  
      if sibling is not None and sibling.tag == "dl":
          # This is another item on an existing list
          dl = sibling
          if (
              not terms
              and len(dl)
              and dl[-1].tag == "dd"
              and len(dl[-1])
          ):
              state = "looselist"
      else:
          # This is a new list
          dl = etree.SubElement(parent, "dl")
      # Add terms
      for term in terms:
          dt = etree.SubElement(dl, "dt")
          dt.text = term
      # Add definition
      self.parser.state.set(state)
      dd = etree.SubElement(dl, "dd")
      self.parser.parseBlocks(dd, [d])
      self.parser.state.reset()
  
      if theRest:
          blocks.insert(0, theRest)
  
file_path: markdown/markdown/extensions/def_list.py
imports: from __future__ import annotations
  from .None import Extension
  from ..blockprocessors import BlockProcessor, ListIndentProcessor
  import xml.etree.ElementTree
  import re
label_desc: Use image node_id 2 for calling the DefListProcessor obj's underlying member method code with example usage: obj.run(parent, blocks) and returns: False