code: def validate_hist_bins(s):
      if isinstance(s, six.string_types) and s == "auto":
          return s
      try:
          return int(s)
      except (TypeError, ValueError):
          pass
  
      try:
          return validate_floatlist(s)
      except ValueError:
          pass
  
      raise ValueError(
          "'hist.bins' must be 'auto', an int or "
          + "a sequence of floats"
      )
  
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 39 for calling a global function with example usage: validate_hist_bins(s) and returns: s, int, validate_floatlist