docs: def get_description_lines(docstring):
      """Extract the description from the given docstring.
  
      This grabs everything up to the first occurrence of something that looks
      like a parameter description. The docstring will be dedented and cleaned
      up using the standard Sphinx methods.
  
      :param str docstring: The source docstring.
      :returns: list
      """
      if prepare_docstring is None:
          raise ImportError('sphinx must be installed to use this function.')
  
      if not isinstance(docstring, str):
          return []
      lines = []
      for line in prepare_docstring(docstring):
          if DESCRIPTION_END_RE.match(line):
              break
          lines.append(line)
      if lines and lines[-1] != '':
          lines.append('')
      return lines