code: def test_python_builtins():
      """Test if python builtins like sum() can be used as callbacks"""
      assert m.test_sum_builtin(sum, [1, 2, 3]) == 6
      assert m.test_sum_builtin(sum, []) == 0
  
file_path: coremltools/deps/pybind11/tests/test_callbacks.py
imports: import time
  from threading import Thread
  import pytest
  import env
  from pybind11_tests import callbacks
label_desc: Use image node_id 9 for calling a global function with example usage: test_python_builtins() without return types