code: def _normalize_string(string):
      return string.replace(".", "_").replace("-", "_")
  
imports: from __future__ import absolute_import
  import distutils.util
  import platform
  import re
  import sys
  import sysconfig
  import warnings
label_desc: Use image node_id 2 for calling a global function with example usage: _normalize_string(string) and returns: string