code: def register_plotting_backend_cb(key) -> None:
      if key == "matplotlib":
          # We defer matplotlib validation, since it's the default
          return
      from pandas.plotting._core import _get_plot_backend
  
      _get_plot_backend(key)
  
file_path: catboost/contrib/python/pandas/py3/pandas/core/config_init.py
imports: from __future__ import annotations
  import os
  from typing import Callable
  import pandas._config.config
  from pandas._config.config import is_bool, is_callable, is_instance_factory, is_int, is_nonnegative_int, is_one_of_factory, is_str, is_text
label_desc: Use image node_id 7 for calling a global function with example usage: register_plotting_backend_cb(key) without return types