code: def _get_single_key(pat: str, silent: bool) -> str:
      keys = _select_options(pat)
      if len(keys) == 0:
          if not silent:
              _warn_if_deprecated(pat)
          raise OptionError(f"No such keys(s): {pat!r}")
      if len(keys) > 1:
          raise OptionError("Pattern matched multiple keys")
      key = keys[0]
  
      if not silent:
          _warn_if_deprecated(key)
  
      key = _translate_key(key)
  
      return key
  
imports: from __future__ import annotations
  from contextlib import ContextDecorator, contextmanager
  import re
  from typing import TYPE_CHECKING, Any, Callable, Generic, NamedTuple, cast
  import warnings
  from pandas._typing import F, T
  from pandas.util._exceptions import find_stack_level
label_desc: Use image node_id 1 for calling a global function with example usage: _get_single_key(pat, silent) and returns: key