code: def python_executable():
      path = shutil.which("python3")
      assert path is not None, "Couldn't find python3 executable"
      return path
  
imports: from functools import lru_cache
  import os
  import re
  import shutil
  import subprocess
  import sys
  import pytest
  import pyarrow
label_desc: Use image node_id 3 for calling a global function with example usage: python_executable() and returns: path