code: def get_default_val(pat: str):
      key = _get_single_key(pat, silent=True)
      return _get_registered_option(key).defval
  
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 6 for calling a global function with example usage: get_default_val(pat) and returns: _get_registered_option