code: def test_builtin_key_type():
      """Test that all the keys in the builtin modules have type str.
  
      Previous versions of pybind11 would add a unicode key in python 2.
      """
      if hasattr(__builtins__, "keys"):
          keys = __builtins__.keys()
      else:  # this is to make pypy happy since builtins is different there.
          keys = __builtins__.__dict__.keys()
  
      assert {type(k) for k in keys} == {str}
  
file_path: coremltools/deps/pybind11/tests/test_modules.py
imports: import pytest
  import env
  from pybind11_tests import ConstructorStats
  from pybind11_tests import modules
  from pybind11_tests.modules import subsubmodule
label_desc: Use image node_id 6 for calling a global function with example usage: test_builtin_key_type() without return types