code: def test_str_api():
      from pybind11_tests import test_str_format
  
      s1, s2 = test_str_format()
      assert s1 == "1 + 2 = 3"
      assert s1 == s2
  
file_path: coremltools/deps/pybind11/tests/test_python_types.py
imports: import pytest
  from pybind11_tests import ExamplePythonTypes, ConstructorStats, has_optional, has_exp_optional
label_desc: Use image node_id 8 for calling a global function with example usage: test_str_api() without return types