code: def _str_index(self):
      idx = self["index"]
      out = []
      if len(idx) == 0:
          return out
  
      default_section = idx.get("default", "")
      out += [f".. index:: {default_section}"]
      for section, references in idx.iteritems():
          if section == "default":
              continue
          elif section == "refguide":
              references = ", ".join(references)
              out += [f"   single: {references}"]
          else:
              references = ",".join(references)
              out += [f"   {section}: {references}"]
      return out
  
imports: import re, inspect, textwrap, pydoc
  import sphinx
  from docscrape import NumpyDocString, FunctionDoc, ClassDoc
label_desc: Use image node_id 14 for calling the SphinxDocString obj's underlying member method code with example usage: obj._str_index() and returns: out, out