code: def from_line(cls, line: str) -> "RetVal":
      if ": " not in line:
          return cls(description=line)
      ident, ty = line.split(":", 1)
      ident = ident.strip()
      ty = ty.strip()
      if ty and not ty.startswith("`"):
          raise DocstringError(
              f"Type should be enclosed in backticks: '{line}'"
          )
      return cls(ident=ident, ty=ty)
  
imports: import argparse
  import logging
  import os
  import re
  import sys
  from collections import OrderedDict
  from dataclasses import dataclass
  from enum import Enum
  from multiprocessing import Pool, cpu_count
  from pathlib import Path
  from typing import List, Optional, Tuple
  import docspec
  from docspec import ApiObject, Class, Data, Function, Indirection, Module
  from docspec_python import format_arglist
  from pydoc_markdown import Processor, PydocMarkdown, Resolver
  from pydoc_markdown.contrib.loaders.python import PythonLoader
  from pydoc_markdown.contrib.renderers.markdown import MarkdownRenderer
label_desc: Use image node_id 1 for calling the RetVal obj's underlying member method code with example usage: obj.from_line(cls, line) and returns: cls, cls