code: def _validate_color_args(self, color, colormap):
      if color is lib.no_default:
          return None
  
      if colormap is not None:
          warnings.warn(
              "'color' and 'colormap' cannot be used "
              "simultaneously. Using 'color'",
              stacklevel=find_stack_level(),
          )
  
      if isinstance(color, dict):
          valid_keys = ["boxes", "whiskers", "medians", "caps"]
          for key in color:
              if key not in valid_keys:
                  raise ValueError(
                      f"color dict contains invalid key '{key}'. "
                      f"The key must be either {valid_keys}"
                  )
      return color
  
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, Literal, NamedTuple
  import warnings
  from matplotlib.artist import setp
  import numpy
  from pandas._libs import lib
  from pandas.util._decorators import cache_readonly
  from pandas.util._exceptions import find_stack_level
  from pandas.core.dtypes.common import is_dict_like
  from pandas.core.dtypes.generic import ABCSeries
  from pandas.core.dtypes.missing import remove_na_arraylike
  import pandas
  import pandas.core.common
  from pandas.io.formats.printing import pprint_thing
  from pandas.plotting._matplotlib.core import LinePlot, MPLPlot
  from pandas.plotting._matplotlib.groupby import create_iter_data_given_by
  from pandas.plotting._matplotlib.style import get_standard_colors
  from pandas.plotting._matplotlib.tools import create_subplots, flatten_axes, maybe_adjust_figure
label_desc: Use image node_id 4 for calling the BoxPlot obj's underlying member method code with example usage: obj._validate_color_args(color, colormap) and returns: color, None