code: def validate_int(s):
      """convert s to int or raise"""
      try:
          return int(s)
      except ValueError:
          raise ValueError('Could not convert "%s" to int' % 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 12 for calling a global function with example usage: validate_int(s) and returns: int