code: def addarc(self, next: "DFAState", label: str) -> None:
      assert isinstance(label, str)
      assert label not in self.arcs
      assert isinstance(next, DFAState)
      self.arcs[label] = next
  
imports: import os
  from typing import IO, Any, Dict, Iterator, List, NoReturn, Optional, Sequence, Tuple, Union
  from blib2to3.pgen2 import grammar, token, tokenize
  from blib2to3.pgen2.tokenize import GoodTokenInfo
  import pkgutil
  import io
label_desc: Use image node_id 2 for calling the DFAState obj's underlying member method code with example usage: obj.addarc(next, label) without return types