code: def test_implicit_value():
      var = ExecutionVariables.START_DATETIME
  
      with pytest.raises(TypeError) as error:
          str(var)
      assert (
          "Pipeline variables do not support __str__ operation."
          in str(error.value)
      )
  
      with pytest.raises(TypeError) as error:
          int(var)
      assert (
          str(error.value)
          == "Pipeline variables do not support __int__ operation."
      )
  
      with pytest.raises(TypeError) as error:
          float(var)
      assert (
          str(error.value)
          == "Pipeline variables do not support __float__ operation."
      )
  
imports: from __future__ import absolute_import
  import pytest
  from sagemaker.workflow.execution_variables import ExecutionVariables
label_desc: Use image node_id 3 for calling a global function with example usage: test_implicit_value() without return types