class_docstr: Container that represents a single row in a table of outputs.
  
  We represent outputs as a table. This class represents a single row in the
  table like a dictionary, where the key is the column name and the value is the
  cell value.
  
  A single cell is designated the "result". This contains the output of the LLM
  model after running any post-processing functions specified by the user.
  
  In addition to behaving like a dictionary, this class provides additional
  methods, including:
  - Getting the value of the "result" cell
  - Setting the value (and optionally the key) of the "result" cell.
  - Add a new non-result cell
  
  Notes: As an implementation detail, the result-cell is always kept as the
  rightmost cell.
code: def __iter__(self) -> Iterator[str]:
      return self._data.__iter__()
  
imports: from __future__ import annotations
  import abc
  from typing import Any, Iterator, Mapping
label_desc: Use image node_id 2 for calling the LLMFnOutputRow obj's underlying member method code with example usage: obj.__iter__() and returns: self