class_docstr: Helper class to wrap inputs/outputs from TFX nodes.
  
  Currently, this class is read-only (setting properties is not implemented).
  
  Internal class: no backwards compatibility guarantees. Will be deprecated
  after 0.15 release.
class_docstr_tok: ["Helper","class","to","wrap","inputs\/outputs","from","TFX","nodes",".","Currently",",","this","class","is","read-only","(","setting","properties","is","not","implemented",")",".","Internal","class",":","no","backwards","compatibility","guarantees",".","Will","be","deprecated","after","0.15","release","."]
code: def __getitem__(self, key):
      if key in self._compat_aliases:
          key = self._compat_aliases[key]
      return self._data[key]
  
file_path: tfx/tfx/types/node_common.py
imports: from typing import Dict, Optional
  from tfx.types.channel import Channel
  from tfx.utils import json_utils
label_desc: Use image node_id 3 for calling the _PropertyDictWrapper obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self