class_docstr: Class to prevent us from re-defining constants (DRY).
code: def __setitem__(self, key, val):  # noqa: D105
      if key != "__dict__" and key in self:
          raise AttributeError(f"Attribute {repr(key)} already set")
      super().__setitem__(key, val)
  
imports: from copy import deepcopy
label_desc: Use image node_id 1 for calling the BunchConst obj's underlying member method code with example usage: obj.__setitem__(key, val) without return types