from typing import Any
from pydantic import BaseModel, PrivateAttr
class FreezableModel(BaseModel):
_frozen: bool = PrivateAttr(default=False)
def freeze(self) -> None:
"""Lock this instance against any further attribute changes."""
object.__setattr__(self, "_frozen", True)
def __setattr__(self, name: str, value: Any):
if getattr(self, "_frozen", False):
raise TypeError(f"{self.__class__.__name__} is frozen; cannot set {name!r}")
super().__setattr__(name, value)
def __delattr__(self, name: str):
if getattr(self, "_frozen", False):
raise TypeError(f"{self.__class__.__name__} is frozen; cannot delete {name!r}")
super().__delattr__(name)
