code: def validate_color(s):
      "return a valid color arg"
      try:
          if s.lower() == "none":
              return "none"
      except AttributeError:
          pass
  
      if isinstance(s, six.string_types):
          if len(s) == 6 or len(s) == 8:
              stmp = "#" + s
              if is_color_like(stmp):
                  return stmp
  
      if is_color_like(s):
          return s
  
      # If it is still valid, it must be a tuple.
      colorarg = s
      msg = ""
      if s.find(",") >= 0:
          # get rid of grouping symbols
          stmp = "".join(
              [c for c in s if c.isdigit() or c == "." or c == ","]
          )
          vals = stmp.split(",")
          if len(vals) not in [3, 4]:
              msg = "\nColor tuples must be of length 3 or 4"
          else:
              try:
                  colorarg = [float(val) for val in vals]
              except ValueError:
                  msg = "\nCould not convert all entries to floats"
  
      if not msg and is_color_like(colorarg):
          return colorarg
  
      raise ValueError("%s does not look like a color arg%s" % (s, msg))
  
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 22 for calling a global function with example usage: validate_color(s) and returns: s, colorarg, str, stmp