code: def test_fetchers_are_public(function_name):
      # Check that the following functions that are only used indirectly in the
      # above tests are public.
      assert hasattr(data, function_name)
  
imports: import numpy
  import skimage.data
  from skimage.data._fetchers import _image_fetcher
  from skimage import io
  from skimage._shared.testing import assert_equal, assert_almost_equal, fetch
  import os
  import pytest
label_desc: Use image node_id 27 for calling a global function with example usage: test_fetchers_are_public(function_name) without return types