code: def test_keymaps():
      key_list = [k for k in mpl.rcParams if "keymap" in k]
      for k in key_list:
          assert isinstance(mpl.rcParams[k], list)
  
imports: import copy
  import os
  import subprocess
  import sys
  from unittest import mock
  from cycler import cycler, Cycler
  import pytest
  import matplotlib
  from matplotlib import _api, _c_internal_utils
  import matplotlib.pyplot
  import matplotlib.colors
  import numpy
  from matplotlib.rcsetup import validate_bool, validate_color, validate_colorlist, _validate_color_or_linecolor, validate_cycler, validate_float, validate_fontstretch, validate_fontweight, validate_hatch, validate_hist_bins, validate_int, validate_markevery, validate_stringlist, validate_sketch, _validate_linestyle, _listify_validator
label_desc: Use image node_id 18 for calling a global function with example usage: test_keymaps() without return types