code: def index(self, doc: str) -> None:  # type: ignore[override]
      if doc not in self._doc_to_id:
          self._doc_to_id[doc]
          Levenshtein_search.add_string(self.index_key, doc)
  
file_path: dedupe/dedupe/levenshtein.py
imports: from typing import Dict, List
  import Levenshtein_search
  from .core import Enumerator
  from .index import Index
label_desc: Use image node_id 2 for calling the LevenshteinIndex obj's underlying member method code with example usage: obj.index(doc) without return types