class_docstr: Accept only ``None`` value.
  
  Use this in conjunction with ``Either(Null, Type)`` or as ``Nullable(Type)``.
class_docstr_tok: ["Accept","only","``","None","``","value",".","Use","this","in","conjunction","with","``","Either","(","Null",",","Type",")","``","or","as","``","Nullable","(","Type",")","``","."]
code: def __init__(
      self, default: Init[None] = None, *, help: str | None = None
  ) -> None:
      super().__init__(default=default, help=help)
  
imports: from __future__ import annotations
  import logging
  import numbers
  import numpy
  from ._sphinx import property_link, register_type_link
  from .bases import Init, PrimitiveProperty
label_desc: Use image node_id 1 to create a new Null object from inherited base classes: PrimitiveProperty with example: obj = Null(default)