class_docstr: Property specified for an Artifact.
code: def __init__(self, type):  # pylint: disable=redefined-builtin
      if type not in Property._ALLOWED_MLMD_TYPES:
          raise ValueError(
              "Property type must be one of %s."
              % list(Property._ALLOWED_MLMD_TYPES.keys())
          )
      self.type = type
  
imports: import enum
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 1 to create a new Property object  with example: obj = Property(type)