code: def __call__(self, s):
      if self.ignorecase:
          s = s.lower()
      if s in self.valid:
          return self.valid[s]
      raise ValueError(
          'Unrecognized %s string "%s": valid strings are %s'
          % (self.key, s, list(six.itervalues(self.valid)))
      )
  
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 2 for calling the ValidateInStrings obj's underlying member method code with example usage: obj.__call__(s) and returns: self