class_docstr: ExecProperty Placeholder represents an execution property.
  
  Prefer to use exec_property(...) to create exec property placeholders.
class_docstr_tok: ["ExecProperty","Placeholder","represents","an","execution","property",".","Prefer","to","use","exec_property","(","...",")","to","create","exec","property","placeholders","."]
docstr: Initializes the class. Consider this private.
docstr_tok: ["Initializes","the","class",".","Consider","this","private","."]
code: def __init__(self, key: str):
      """Initializes the class. Consider this private."""
      super().__init__(
          expected_type=Union[
              message.Message, placeholder_base.ValueType
          ]
      )
      self._key = key
  
imports: from __future__ import annotations
  import typing
  from typing import Any, Literal, Optional, Union
  from tfx.dsl.placeholder import placeholder_base
  from tfx.proto.orchestration import placeholder_pb2
  from google.protobuf import message
label_desc: Use image node_id 1 to create a new ExecPropertyPlaceholder object from inherited base classes: placeholder_base with example: obj = ExecPropertyPlaceholder(key)