code: def _get_key(
      self, name: str
  ) -> Tuple[str, str, Optional[int], Optional[int]]:
      return ("._.", name, self._start, self._end)
  
file_path: spacy/spacy/tokens/underscore.py
imports: import copy
  import functools
  from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
  from ..errors import Errors
label_desc: Use image node_id 8 for calling the Underscore obj's underlying member method code with example usage: obj._get_key(name) and returns: str,  name,  self,  self