code: def _normalize_string(string):
      # type: (str) -> str
      return string.replace(".", "_").replace("-", "_")
  
imports: from __future__ import absolute_import
  import distutils.util
  import collections
  import logging
  import os
  import platform
  import re
  import struct
  import sys
  import sysconfig
  import warnings
  from ._typing import TYPE_CHECKING, cast
label_desc: Use image node_id 4 for calling a global function with example usage: _normalize_string(string) and returns: string