No puede hacer que las clases de Python sean completamente inmutables. Sin embargo, puedes imitarlo:

 class C: _immutable = False def __setattr__(self, name, value): if self._immutable: raise TypeError(f"Can't set attribute, {self!r} is immutable.") super().__setattr__(name, value)

Ejemplo:

 >>> c = C() >>> c.hello = 123 >>> c.hello 123 >>> c._immutable = True >>> c.hello = 456 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 5, in __setattr__ TypeError: Can't set attribute, <__main__.C object at 0x000002087C679D20> is immutable.

Si desea configurarlo en la inicialización, puede agregar un __init__ así:

 class C: _immutable = False def __init__(self, immutable=False): self._immutable = immutable def __setattr__(self, name, value): if self._immutable: raise TypeError(f"Can't set attribute, {self!r} is immutable.") super().__setattr__(name, value)

Tenga en cuenta que aún puede omitirlo accediendo y modificando el __dict__ de la instancia directamente:

 >>> c = C(immutable=True) >>> c.__dict__["hello"] = 123 >>> c.hello 123

Puede intentar bloquearlo así:

 class C: _immutable = False def __init__(self, immutable=False): self._immutable = immutable def __getattribute__(self, name): if name == "__dict__": raise TypeError("Can't access class dict.") return super().__getattribute__(name) def __setattr__(self, name, value): if self._immutable: raise TypeError(f"Can't set attribute, {self!r} is immutable.") super().__setattr__(name, value)

Pero incluso entonces es posible pasar por alto:

 >>> c = C(immutable=True) >>> object.__getattribute__(c, "__dict__")["hello"] = 123 >>> c.hello 123