code: def parse(s):
      if not isinstance(s, str):
          raise TypeError("expected a string")
      if len(s) != 5 or not PropbankInflection._VALIDATE.match(s):
          raise ValueError("Bad propbank inflection string %r" % s)
      return PropbankInflection(*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 4 for calling the PropbankInflection obj's underlying member method code with example usage: obj.parse(s) and returns: PropbankInflection