code: def assert_not_all_same(items, msg=None):
      assert items.count(items[0]) != len(items), msg
  
imports: from __future__ import annotations
  import logging
  import os
  import shutil
  import subprocess
  import sys
  import sysconfig
  import tempfile
  from io import BytesIO
  import pytest
  from packaging.version import parse
  from PIL import Image, ImageMath, features
label_desc: Use image node_id 9 for calling a global function with example usage: assert_not_all_same(items, msg) without return types