code: def _warn_if_deprecated(key: str) -> bool:
      """
      Checks if `key` is a deprecated option and if so, prints a warning.
  
      Returns
      -------
      bool - True if `key` is deprecated, False otherwise.
      """
      d = _get_deprecated_option(key)
      if d:
          if d.msg:
              warnings.warn(
                  d.msg,
                  FutureWarning,
                  stacklevel=find_stack_level(),
              )
          else:
              msg = f"'{key}' is deprecated"
              if d.removal_ver:
                  msg += f" and will be removed in {d.removal_ver}"
              if d.rkey:
                  msg += f", please use '{d.rkey}' instead."
              else:
                  msg += ", please refrain from using it."
  
              warnings.warn(
                  msg, FutureWarning, stacklevel=find_stack_level()
              )
          return True
      return False
  
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 15 for calling a global function with example usage: _warn_if_deprecated(key) and returns: False, True