class_docstr: Base class representing ``@step`` decorator outputs.
class_docstr_tok: ["Base","class","representing","``","@","step","``","decorator","outputs","."]
docstr: Get the expression structure for workflow service calls.
docstr_tok: ["Get","the","expression","structure","for","workflow","service","calls","."]
code: def expr(self) -> RequestType:
      """Get the expression structure for workflow service calls."""
  
file_path: sagemaker-python-sdk/src/sagemaker/workflow/step_outputs.py
imports: from __future__ import absolute_import
  import abc
  from typing import List, TYPE_CHECKING
  from sagemaker.workflow.entities import RequestType, PipelineVariable
label_desc: Use image node_id 3 for calling the StepOutput obj's underlying member method code with example usage: obj.expr() without return types