code: def __str__(self):
      s = "{} {} {} {} {} {}".format(
          self.fileid,
          self.sentnum,
          self.wordnum,
          self.tagger,
          self.roleset,
          self.inflection,
      )
      items = self.arguments + ((self.predicate, "rel"),)
      for argloc, argid in sorted(items):
          s += f" {argloc}-{argid}"
      return s
  
imports: import re
  from functools import total_ordering
  from xml.etree import ElementTree
  from nltk.corpus.reader.api import *
  from nltk.corpus.reader.util import *
  from nltk.internals import raise_unorderable_types
  from nltk.tree import Tree
label_desc: Use image node_id 6 for calling the PropbankInstance obj's underlying member method code with example usage: obj.__str__() and returns: s