code: def test_run():
      # test code in README.rst file
      # find any chunks after ::
      # which code lines, which start with <tab> >>>
      parent_dir = os.path.dirname(os.path.dirname(__file__))
      with open(os.path.join(parent_dir, "README.rst")) as f:
          chunk = [
              line.replace("\t>>> ", "")
              for line in f
              if line.startswith("\t>>> ")
          ]
  
      code = "".join(chunk)
      print("running::\n" + code)
      print("result:", six.exec_(code, {}, {}))
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_run() without return types