code: def test_string_split():
      test_string = "z23a"
      test_str_result = ["z", 23, "a"]
      assert_equal(alphanumeric_key(test_string), test_str_result)
  
imports: import os
  import itertools
  import numpy
  import imageio.v3
  from skimage import data_dir
  from skimage.io.collection import ImageCollection, MultiImage, alphanumeric_key
  from skimage.io import reset_plugins
  from skimage._shared import testing
  from skimage._shared.testing import assert_equal, assert_allclose, fetch
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: test_string_split() without return types