code: def token_ix(self):
      return self.tokens[0] if len(self.tokens) > 0 else None
  
imports: import itertools
  import os
  import re
  from string import Template
  from typing import Any, Callable, Dict, List, NamedTuple, Optional, Tuple
  from tokenizers import Encoding, Tokenizer
label_desc: Use image node_id 2 for calling the CharState obj's underlying member method code with example usage: obj.token_ix() and returns: unknown