code: def __init__(self, on, at, neg=False):
      self.on = on
      self.at = at
      self.neg = neg
  
imports: from __future__ import annotations
  import abc
  import copy
  import math
  import numbers
  import typing
  from river import base, tree
label_desc: Use image node_id 1 to create a new Literal object from inherited base classes: base with example: obj = Literal(on, at, neg)