class_docstr: Main class from which all Flows should inherit.
  
  Attributes
  ----------
  index
  input
docstr: [Legacy function - do not use]
code: def cmd(self, cmdline, input={}, output=[]):
      """
      [Legacy function - do not use]
      """
      return cmd_with_io.cmd(cmdline, input=input, output=output)
  
imports: import inspect
  import os
  import sys
  import traceback
  from itertools import islice
  from types import FunctionType, MethodType
  from typing import Any, Callable, List, Optional, Tuple
  from .None import cmd_with_io
  from .parameters import DelayedEvaluationParameter, Parameter
  from .exception import MetaflowException, MissingInMergeArtifactsException, UnhandledInMergeArtifactsException
  from .graph import FlowGraph
  from .unbounded_foreach import UnboundedForeachInput
  from .datastore.inputs import Inputs
label_desc: Use image node_id 8 for calling the FlowSpec obj's underlying member method code with example usage: obj.cmd(cmdline, input, output) and returns: cmd_with_io