code: def validate_toolbar(s):
      validator = ValidateInStrings(
          "toolbar",
          ["None", "toolbar2", "toolmanager"],
          ignorecase=True,
      )
      return validator(s)
  
imports: from __future__ import absolute_import, division, print_function
  import six
  from functools import reduce
  import operator
  import os
  import warnings
  import re
  from matplotlib import cbook, testing
  from matplotlib.cbook import mplDeprecation, deprecated, ls_mapper
  from matplotlib.fontconfig_pattern import parse_fontconfig_pattern
  from matplotlib.colors import is_color_like
  from cycler import Cycler, cycler
label_desc: Use image node_id 18 for calling a global function with example usage: validate_toolbar(s) and returns: validator