code: def _normpath(s):
      return s.replace("/", os.sep)
  
imports: from __future__ import annotations
  import os.path
  import pytest
  from flake8 import utils
  from flake8.discover_files import _filenames_from
  from flake8.discover_files import expand_paths
label_desc: Use image node_id 3 for calling a global function with example usage: _normpath(s) and returns: s